Kerriann Herdelin
Executive Director
Kerriann Herdelin joined GPTL in 2010 and has grown the National Junior Tennis & Learning from 50 players a year to approaching 2000 players yearly.  She has over 20 years of tennis experience and educational leadership. She oversees all business operations and programming, including Administration, Communication, Advancement, Community Outreach Programs, Events, grants and innovation. Kerriann earned a bachelor’s in Elementary Education, a Masters in Special Education and studied Educational Leadership. She was a Division I scholarship player at Niagara University.  Kerrian coached The Hill School tennis team connecting her with GPTL. Kerriann has three daughters that all play tennis.

Email: kerriann@gptltennis.com

 

Chris Herdelin
Director of Strategy & Analysis
Chris Herdelin, GPTL’s Head Pro has been appointed to a new position as Quantitative Analyst funded by USTA Foundation.  Chris will foster improvements in tennis, education, health, and fitness using data to track and evaluate individual performance and offer suggestions for increased productivity and overall growth and development.  He has a Bachelor of Arts in Economics from Thomas Edison State University, Bachelor of Arts in History from Eastern University and is currently a Graduate Student at Texas A&M University working on his Masters of Science in Financial Economics.  Chris has been part of GPTL from 2010 mentoring all year-round tennis programs and has an extensive tennis background.  Chris was a Director of High Performance at the Arthur Ashe Youth Tennis Center in Philadelphia, where programs focus on exposing disadvantaged youth to lifetime tennis play.  Chris’ focus for GPTL will include surveying customer experiences, optimizing pricing, grant research, and submissions, analyzing economic parameters, tracking performance metrics and applying data to implement mission focused strategies and to build partnerships.  For the after-school program, he will evaluate the performance of the participants and design the curriculum with a focus on health, fitness, education and tennis.

Email: chris@gptltennis.com

 

Maryellen Wilson
Administrative Manager
Maryellen Wilson joined GPTL in 2009.  As Administrative Manager, she manages administrative and support operations that include program registrations, communications, website content and Leagues organization.  Maryellen has over 45 years of tennis playing experience and has PTR Certifications for Adult Development and 10 and Under Tennis.  Maryellen is a graduate of the University of Delaware and played four years of Division I Varsity tennis for the Blue Hens earning MVP honors.  For several years, Maryellen coached the Pottsgrove High School Boys’ and Girls’ tennis teams.

Email: maryellen@gptltennis.com

 

Chrissy Chase Sinatra
Development Director 

Chrissy Chase Sinatra combines her life long love of tennis with a passion for youth empowerment programs and non-profit advocacy. Chrissy is the first person to serve as Development Director for a regional NJTL chapter funded by the USTA Foundation. She oversees and implements communication strategies for raising vital funds by championing philanthropic relationships with donors, sponsors and EITC contributors.  Chrissy grew up playing and coaching tennis. Her father started the first tennis camp in the United States, Chase Tennis Camps, and was instrumental in defining tennis education by inspiring thousands of players and coaches. Philanthropy is not only a responsibility it is a necessity and there is no greater satisfaction than being generous to a brighter future.

Email: chrissy@gptltennis.com

 

Michael Esz
Director of Junior Programming & Development
Michael brings 23 years of professional coaching experience to GPTL.  He is currently certified with the PTR, USPTA, 10 and Under, and USTA Level 1 sports science commission.  In addition, he has been selected to the USTA High Performance program.  Michael is the former Head Pro and Director of Junior Development at Frog Hollow Racquet Club where he has extensively developed the junior program and the area’s top level players for the past nine years.  He was also a USTA National Zonals coach, National Nike Junior Tour coach for Middle States, and has coached numerous players that have received Division I college scholarships.  Michael is also an Early Developmental Coach (EDC) for the USTA Middle States where five of his students were selected to train with team Middle States.

Email: michael@gptltennis.com

 

Greg Williams
Director of Adult Programming
Greg has over 25 years of tennis coaching experience in professional, collegiate, recreational, country clubs, sports clubs, non-profit organizations, adult and juniors of all levels.  Greg played in the Bill Johnson tennis program growing up in Philadelphia.  Greg formerly was the Director of Community Programming at Legacy Youth Tennis and Education.  He managed and supervised 45 NJTL sites and 24 After School Program sites in Philadelphia. Greg was a USTA High Performance National Coach, USTA Area Training Center-Player Development Head Coach, trained and coached one of his professional players at the US Open tennis tournament and was an Arthur Ashe Youth Tennis Center/Travel Team Coach.  Greg earned a USTA National Junior Ranking in the Top 30 in the U.S., American Tennis Association (ATA) ranked #1, 3 time NCAA All American in singles and doubles.  Greg graduated from Hampton University and was a scholarship player.  He has his PTR and USPTA certifications.

Email: greg@gptltennis.com

 

Andrew Wilson
Andrew Wilson has coached for GPTL since 2010.  He has PTR Certifications for 11 to 17 and 10 and Under Tennis.  Andrew is a graduate of Lebanon Valley College where he played four years of Division III Men’s Varsity tennis and was a MAC Academic Honor Roll recipient.  He has competed in USTA sanctioned junior and adult tournaments and was MVP for the Boyertown Area Senior High School Varsity tennis team.

 

 

 

Mark Kauffman
Mark Kauffman has over 20 years of tennis playing experience and several years of instructional experience with youth tennis programs.  He was an instructor at summer tennis camps in Lancaster where he developed various lesson plans for children of all skill levels.  Mark played competitively as a junior in the USTA Middle States Central Pennsylvania region where he held a top ten ranking and was the number one player and captain of his high school tennis team.  Mark is a graduate of Loyola University Maryland.