Coaching Staff


#40 Mark Mason, Manager

Mark Mason enters his ninth season at the helm of the York Revolution in 2022. With 550 victories in addition to the 2017 Atlantic League championship, he is the winningest manager in Revolution history.

The longest-tenured manager in club history and longest-tenured active manager in the league, Mason’s nine seasons tie him for the fourth-longest tenure in league history and mark the second-longest continuous stint with one franchise in league history. He enters the season #7 in league history in wins, just 22 wins shy of moving into the top four.

Mason also enters his 12th overall season on the staff in 2022 along with Enohel Polanco as the longest-tenured staff members in club history. The two have been part of 771 combined victories. 

Annual Success:

Mason most recently guided the Revs during their return to the field in 2021. The skipper steered the team through a season filled with roster turnover to a late-second half playoff push that saw them in contention all the way until the next-to-last day of the season. Some of the turnover came for good reason as York saw six players’ contracts purchased by MLB organizations, tied for the most in franchise history (2007, 2011).

Mason oversaw an incredible turnaround during the 2019 season that saw the Revs overcome a 13-30 start, going 62-35 from June 10 on to post the league’s second best overall record at 75-65. That included a stretch on which York won 14 of 15 series, going 39-10 from June 10-August 4, and a 27-6 mark from June 25-August 4. York won 41 second-half games, their most in a half since 2014 and most in a second half since 2012. The Revs offense blasted a franchise record 167 home runs, the league’s highest total since 2010, while batting a league-best .293 (league’s highest since 2012) with 762 runs scored (100 more than any other team and league’s most since 2011). Mason recruited a club record eight mid-season All-Stars, three post-season All-Stars, and the Atlantic League Player of the Year for the second time in three seasons. It was all part of leading the franchise to its eighth postseason berth and fourth under his guidance. Mason also managed the Freedom Division to victory at the Atlantic League All-Star Game for the second consecutive season, this time in York at PeoplesBank Park.

Mason guided a 2018 team that overcame numerous injuries to go 68-58 and boast the league’s most prolific offense. He earned his 400th win as manager on August 16 vs. the New Britain Bees and managed the Freedom Division at the 2018 Atlantic League All-Star Game.

Mason orchestrated a dramatic midseason turnaround in 2017, guiding the Revolution to a second half division title and a 6-1 postseason record en route to winning the franchise’s third Atlantic League championship and first since 2011. The 6-1 run through the playoffs established the best postseason mark in Revolution history. Once again fielding arguably the league’s most exciting team, Mason built an offense that paced the circuit with 139 home runs. He also claimed his 300th win as Revolution manager during the 2017 season, doing so on June 4.

Mason guided the Revolution to a 76-win season in 2016, the franchise’s third highest win total all-time. It included a personal milestone for Mason, who tied his predecessor Andy Etchebarren for the franchise’s all-time wins record with his 237th victory on June 16, 2016, in a 5-3 win at Somerset, and surpassed “Etch” with win number 238 the following night, June 17, 2016, in a 6-4 home win vs. Bridgeport. His squad was known for its never-say-die approach, pulling off an incredible team-record 44 come-from-behind victories, eight more than the previous high, including 15 victories when trailing heading to the late innings. Mason also pushed the right buttons in close games, as his team went 43-28 in games decided by two runs or fewer, and 15-4 in one-run games at home. Overall, York’s home field advantage was the Atlantic League’s best with a 43-27 mark at PeoplesBank Park. Offensively, York bashed 133 home runs, their highest total in four years and the league’s second most.

Known for his in-game tactics as well as his proven success in constructing a roster, Mason navigated the Atlantic League’s second-best turnaround from first half to second half in his third year as manager, as the 2015 Revs went 40-29 in the second half, their winningest second half since the 2012 campaign. Mason’s squad became one of the most exciting in the league, setting a club record with 11 walk-off wins and nine extra-inning wins, while leading the league with 29 home runs in the month of September. The Revs’ 34 comeback wins fell just short of matching a then-club record of 36, tied the season before. York finished the season ranking second in the league in batting average and homers, and tied for second in stolen bases.

That followed a highly successful 2014 season in which Mason was named the Atlantic League Manager of the Year. Mason oversaw the league’s biggest increase in wins and winning percentage from the previous year, as the 2014 Revs returned to the postseason after a one-year absence, gaining national attention during their playoff run, and knocking down numerous club records in the process.

Mason’s 2014 squad totaled 78 wins during the regular season, the second-highest total in franchise history. York punched its postseason ticket by winning a first half title for the second time, with a club record 41 first half victories. Mason’s offense featured the individual league leaders in batting (Justin Greene, .358), RBI (Chad Tracy, 97), stolen bases (Wilson Valdez, 55), and triples (Eric Patterson, 17). The lineup amassed 188 stolen bases as a team, nearly doubling the previous franchise record, and notching the league’s highest total since the 2009 season. That exciting, balanced offensive attack was combined with a pitching staff that posted the league’s second lowest ERA at 3.44 as a team, by far the best in franchise history. Other highlights included a team record 23 victories in games decided by one run, and a club record-tying 36 come-from-behind wins. The team’s most memorable moment occurred in Game 3 of the Division Series as the Revs secured an extra inning come-from-behind victory over Sugar Land in front of, at the time, the biggest postseason crowd in PeoplesBank Park history. Fans across the country viewed highlights from that night as centerfielder Sean Smith tied the game with an eighth inning home run, hopping around the bases on one foot after sustaining a serious knee injury at first base. The play was featured on ESPN and Good Morning America among other national outlets, while garnering nearly two million views on the club’s YouTube channel. 

In his first season as manager, Mason guided the Revs to overcome an incredible amount of roster turnover, finishing just half a game out of the league’s top half of the standings with the fifth-best overall record. Despite finishing the season with just nine players who were on the Opening Night roster and only two position players who were in the Opening Night lineup, Mason recruited and assembled the most accomplished roster in club history as a franchise-record 21 players with Major League experience suited up for the Revs in 2013. Mason also helped send six players back to Major League organizations during the season and three others to high-caliber leagues outside of the United States. 

Following a highly successful three-year tenure as the club’s pitching coach, Mason’s promotion to manager was announced on September 4, 2012, as he succeeded Etchebarren in becoming the third field manager in Revs history.

On the Mound:

As pitching coach, Mason’s staffs amassed a league-best 221-183 record in three seasons, and the Revs were one of only two Atlantic League teams to reach the playoffs each of those three years. Mason has also produced numerous pitchers whose contracts have been purchased by Major League organizations, nine of whom have gone on to pitch in the Majors including four who made their MLB debuts. In addition to his success as pitching coach, Mason has held a leading role in player procurement since his arrival before the 2010 season, as his far-reaching connections and tireless efforts have helped the Revs win three championships and establish a tradition of excellence.

In Mason’s first two seasons with York, the Revs became just the second team in Atlantic League history to win back-to-back championships, doing so in 2010 and 2011. The team’s postseason success centered around Mason’s pitching staffs, as the Revs posted a combined 3.10 playoff ERA with a 12-5 record during those championship runs.

Under Mason’s guidance, the Revs finished in the top half of the league in team ERA in 2011 and 2012, including a then-club record 3.99 ERA during the 2012 season.  The Revs also set team records in shutouts with nine and 11 in those two seasons respectively, leading the league both years.

From York to the Majors:

Since Mason’s arrival in 2010, the Revs have had 35 players signed in-season by Major League organizations, 21 of whom have come from Mason’s pitching staffs.  Nine of those pitchers and 10 total players have made it to the Major Leagues. Lefty Justin Hampson (York ’10) worked a 1.80 ERA in 13 appearances for the New York Mets in 2012. Right-hander Shawn Hill, who began the 2012 season with the Revolution where he did not allow a run in 27.2 innings as a star, finished that season in the Toronto Blue Jays bullpen, earning a win with three scoreless innings against the New York Yankees in his lone appearance. Lefty Scott Rice (York ‘11) made the New York Mets Opening Day roster in 2013 for his Major League debut, and earned four wins in 73 appearances with a 3.71 ERA. Four more were promoted to the big leagues in 2014 alone. Southpaw Ian Thomas (York ’12) made his Major League debut and the Atlanta Braves Opening Day roster. Righty Julio DePaula (York ’13, ’14) was called up by the Baltimore Orioles on July 7, just 11 days after his contract was purchased from the Revolution. Left-hander Ryan Feierabend (York ’12) earned a call-up by the Texas Rangers that same month. Corner infielder Andy Marte (York ’13) was called up by Arizona on July 31 and homered as a pinch-hitter in his first at-bat for the Diamondbacks that night. Lefty Edward Paredes (York ‘13-15) earned the win in his Major League debut for the Los Angeles Dodgers on July 24, 2017, and worked a 3.24 ERA in 10 appearances before going 2-0 in 2018. Lefty Ross Detwiler opened the 2018 season in York’s starting rotation and returned to the Majors with the Seattle Mariners that same season. In 2019, Detwiler went from Revs Opening Day starter to the Major Leagues with the Chicago White Sox in a span of about two months. The 2019 season also saw Feierabend return to the big leagues with Toronto and RHP Zac Grotz (York ’18) make his Major League debut with Seattle. Grotz returned to Seattle and Detwiler was back with Chicago in 2020, while Detwiler split 2021 with Miami and San Diego.

A Lifetime in Baseball:

The 2022 season will be Mason’s 34th as a coach or manager at either the collegiate or professional level. He came to York from Western Pennsylvania, where he had most recently been the manager of the Washington Wild Things of the Frontier League. Mason’s accomplishments in the Frontier League are numerous, having worked with three separate organizations on that circuit. His first stint in Washington began in 2002 as pitching coach, where he remained for three seasons. In 2005, he became manager of the Ohio Valley Red Coats and was named Frontier League Manager of the Year in his lone season as skipper of the team. In 2006, Mason returned to Washington as pitching coach, before taking the managerial reins of the Chillicothe Paints, also of the Frontier League. He managed the Paints for two seasons before joining the Wild Things for a third stint, this time as manager. Mason’s pitching staffs led the Frontier League in wins in 2002, 2003, 2004, and 2006.

Before joining the pro game, Mason spent 16 seasons from 1987 through 2002 as the head baseball coach at Washington & Jefferson College in Washington, PA. 

As a player, Mason pitched in the Pittsburgh Pirates organization, ascending as high as Double-A Lynn (MA) of the Eastern League. “Mase” also pitched at Waynesburg (Pa.) College, which is now Waynesburg University.

#24 Enohel Polanco, Hitting Coach/Third Base Coach

Enohel Polanco returns to the Revs for his 12th season on the staff, joining manager Mark Mason as the longest-tenured members of the baseball staff in franchise history. “Polo” made the transition from player to coach during the 2010 season, initially as the club’s first ever player-coach, holding both an active roster spot as an infielder as well as a spot on the coaching staff. During his time in York, he has played a major role both on the field as the team’s third base coach, and behind the scenes in helping the club reach the postseason during seven of his 11 years. The 2010 and 2011 championships marked the first Atlantic League titles of Polanco’s career, before adding a third ring with the Revs in 2017. 

When the Revs landed Polanco, they acquired a respected veteran whose Atlantic League ties run deep. The 2022 season is his 19th in the league, and the Revs are his sixth Atlantic League team.

A native of Puerto Plata, Dominican Republic, Polanco began his professional career in 1995 when he signed with the New York Mets. Primarily a shortstop early on, his 14-year career as a player also took him to the Chicago Cubs, Cleveland Indians, Florida Marlins, and Colorado Rockies farm systems, reaching the Triple-A level with Cleveland and Florida in 2000. In total, he played for 21 different clubs, including seven during the 2000 season alone.

Polanco first signed to play in the Atlantic League in 2001 as a member of the Atlantic City Surf, batting .303 that first season. He has also played in the Atlantic League for Nashua, Southern Maryland, Bridgeport, Newark, and York, batting a combined .290 during his time on the circuit.

With the Revs, Polanco has been instrumental in the organization’s player procurement efforts and his connections, especially in the Latin American baseball community, have helped the Revs land numerous key players during the franchise’s sustained period of success. His behind-the-scenes work with the team’s hitters has paid huge dividends as well, as the Revs have led the league with a combined .279 team average, 14,254 total hits, and 7,661 total runs in the 11 years since his arrival, while ranking second with 1,427 home runs. Polanco has coached 40 position players to mid-season All-Star nods and 32 position players to all-league selections including Atlantic League Player of the Year selections Scott Grimes (2010), Alonzo Harris (2017) who was also named Baseball America’s Independent Leagues Player of the Year taking home the industry’s top national award, and Telvin Nash (2019). He has also mentored 14 position players whose contracts have been purchased in-season by Major League organizations. Polanco and the entire Revs coaching staff had the honor of coaching the Freedom Division to victories at the 2011 Atlantic League All-Star Game in York and the 2012 All-Star Game in Camden. They also coached the Freedom Division squad at the 2018 Atlantic League All-Star Game on Long Island. Polanco managed the Liberty Division squad opposite the Mason-led Freedom Division squad at the 2019 Atlantic League All-Star Game at PeoplesBank Park in York.


#41 Sandy DeLeon, Bullpen Coach

Sandy DeLeon enters his fourth season as full-time bullpen coach in 2022, having previously worked in the same role for the team on a part-time basis around his coaching and managing schedule on other circuits. DeLeon rejoined York for its 2017 second half and postseason championship run.

A veteran of the Atlantic League as a player, the Revs became DeLeon’s eighth and final Atlantic League squad during his playing career, as he appeared in 18 games for York during the franchise’s first championship season in 2010, which was DeLeon’s seventh in the Atlantic League as a player.

DeLeon was originally signed as a non-drafted free agent by the Seattle Mariners in 1994. His team lost in the Dominican Summer League finals to Enohel Polanco’s Mets squad during his first pro season. DeLeon was traded to the San Francisco Giants for pitcher Salomon Torres in 1995 and played in the Giants farm system from 1995-99. His playing career later took him to the Frontier League in 2000 and the Atlantic League in 2001 when he suited up for four different clubs (BPT, SOM, AC, LV). It was the start of five straight years in the Atlantic League for DeLeon, which included stops with Long Island, Newark, and the Road Warriors. He also spent time in the Golden League in 2005 and 2006 as well as the Can-Am in 2006.

DeLeon returned to the Atlantic League in 2007 for his third stint with Bridgeport. After time in the United League in 2009, DeLeon was back in the league with York as a member of the championship squad in 2010. He enjoyed two more professional seasons as a player in the Can-Am before moving toward his coaching career.

As a coach, DeLeon was an instrumental figure in starting the Empire League and Thoroughbred League while spending time with York on a part-time basis before assuming his current full-time role.

The 42-year-old was born in New York City and still makes his home in the Big Apple where he has worked as a nurse when not coaching baseball. DeLeon graduated from Brandeis High School in Manhattan and attended Rockland Community College before signing with Seattle.

DeLeon played for Dusty Baker, Bill Madlock, Duffy Dyer, Gary Templeton, and Hall of Famer Tim Raines during his career, and played with the likes of Mark Whiten, Jose Lind, Alex Rodriguez, and Hall of Famers Randy Johnson and Rickey Henderson as teammates.

DeLeon is the son of 13-year Major League veteran Dominican-born RHP Jose DeLeon. The elder DeLeon won 86 games in a big league career that included stops with the Pirates, White Sox, Cardinals, Phillies, and Expos. He won a career-high 16 games for St. Louis in 1989.

Eddie Gonzalez, Coach

Eddie Gonzalez enters his 16th season of professional baseball and second on the Revolution coaching staff. Eddie is nationally recognized as a player procurement specialist who recruits players to MLB Partner Leagues including the Atlantic League, American Association, and Frontier League. Gonzalez is the Director of Baseball Operations for the Empire League, a rookie professional development league that prepares and gets players ready to sign with high-level professional leagues.

A native of Mayaguez, Puerto Rico, the 38-year-old Gonzalez played professionally for parts of seven seasons and was a Frontier League All-Star in 2008 with the Florence Freedom. Known for his defensive skills as a catcher, Gonzalez will serve on the Revolution coaching staff as his schedule as Director of Baseball Operations for the Empire League permits.


Meghan Haas, Athletic Trainer

Meghan Haas enters her second season as Head Athletic Trainer for the York Revolution in 2022.

Haas played a major role in the Revs’ success during the 2021 season, as the organization enjoyed a season with far lower injury rates compared to other seasons as well as compared to other teams in the Atlantic League. Haas’ tireless work ethic and expertise allowed both pitchers and position players to perform at their highest ability, while remaining healthy and largely injury-free throughout the grueling 120-game season. While her approach directly resulted in the Revs experiencing the benefits of injury prevention, her individual care also helped numerous players return from injury far sooner than anticipated and resume top-level performance while remaining injury-free. Haas’ leadership helped the team overcome expectations and remain in contention for a postseason berth all the way to the final weekend of the season.

A native of the Keystone State, Haas was born in Williamsport and graduated from Hamburg Area High School. Haas grew up in athletics, competing in softball, field hockey, and cheerleading, and went on to attend California University of Pa., where she graduated with a BS in Athletic Training. From there, Haas attended Alvernia University, where she completed her Master’s in Education.

Haas has spent most of her life residing in the Reading area, where she served as Athletic Trainer for Wyomissing Area High School for 10 years and at Berks Catholic High School for two years. Haas also spent six years at her alma mater, Alvernia University, as Head Athletic Trainer, overseeing care for student athletes of all of the university’s men’s and women’s teams. Among her previous career highlights was serving as Senior Athletic Trainer, overseeing all medical coverage with Philadelphia 76ers camps for two summers.

During the baseball offseason, Haas’ role with WellSpan takes her to high schools across the region, where she is able to use her same expert approach from which professional athletes benefit to help local student-athletes perform their best and remain healthy while doing so.

Away from the ballpark, Haas enjoys spending time at her local gym where she teaches daily fitness classes, as well as rooting for the 76ers and her favorite Pittsburgh sports teams. Her favorite off-field activity is spending time with family and cheering on her children at their athletic events. Haas has a son, Jackson (17), and two daughters, Mia (15) and Emerson (13).


John Deitch, MD, Head Team Physician

John Deitch serves as Medical Director of Sports Medicine for WellSpan Health and as the WellSpan Orthopedics York Site Director. WellSpan Sports Medicine is the official sports medicine provider of the York Revolution. Deitch leads a multidisciplinary team of physicians, advanced practitioners, therapists, licensed athletic trainers, and nutritionists committed to providing comprehensive sports medicine care to individual athletes, local teams including numerous high schools, Gettysburg College, the Revolution, and anyone else who engages in a physically active lifestyle. Deitch’s team focuses on the whole continuum of sports medicine care from injury prevention to surgery to safe return to work or play.

Deitch was active in sports during his own playing days, experiencing sports injuries and meeting physicians, therapists, and athletic trainers who greatly influenced his decision to pursue a career in sports medicine. Most of all, Dr. Deitch credits his parents as his biggest influence and values the opportunity to help others make positive changes in their lives. 

Deitch is Board Certified in Orthopedic Surgery and Orthopedic Sports Medicine by the American Board of Orthopaedic Surgery. He is a graduate of Temple University School of Medicine, completed Internship and Residency Programs at University of Cincinnati, completed the Fellowship Program at Baylor College of Medicine-Houston, and completed his undergraduate degree at Elizabethtown College. 

Deitch and his wife are the parents of three children who are active in youth sports. He has served as a youth soccer coach, baseball coach, and basketball coach. He is active in the community and has volunteered as a board member for FCA-York and Penn Academies and served the York Young Revolution as the organization’s Medical and Safety Officer. Deitch enjoys weight training and traveling with family in his free time, enjoying outdoor activities including scuba diving and hunting.