Coaches & Directors

We are here to support your needs. If your questions are related to workouts, meets, events, goal setting, and other swimming related needs, please contact one of the coaches. For all questions related to administrative, such as dues, safety, or policy issues, please contact the Head Coach.

Coaching Staff

Sean P Sell

Head Coach / Nationals Coach / Owner


Coach Sean is the head coach of Select Swim and the founder of the team.  Sean brings a wealth of experience, a passion for helping kids and an analytical, scientific approach to coaching. Coach Sean started swimming on the neighborhood swim team at age five. He swam with Dallas Aquatic Club (now Dallas Mustangs) for six years and was a Jr. National Qualifier at age 15. He also swam for City of Plano Swimmers (COPS) and Lakeside Aquatic Club (LAC). Coach Sean has extensive competitive experience, which includes representing the United States in international competitions in Europe and Asia. He holds a BS business from UTD and an Executive MBA from SMU. Prior to coaching, Sean was a semiconductor engineer and a corporate officer with two start-ups in mainland China. Coach Sean has been a part time coach with Colorado Springs Swim Team (CSST) in Colorado Springs and the Dallas Mustangs. While coaching Silver and Gold groups with the Mustangs, Sean developed and coached national top 16 swimmers, Texas Age Group Swimming (TAGS) Champions and Sectional Qualifiers. In 2013, Sean was hired as the assistant head coach for City of Plano Swimmers (COPS), where he continued to help swimmers achieve their goals producing US Open, Junior Nationals, Sectional and Texas Age Group Swimmers (TAGS) Champions.  In 2015, Sean decided to start a new team, Select Team of Aquatic Racers, a team that is focused on personal development of each swimmer and used his special team culture to produce fast, happy swimmers. He became a coach to help kids believe in themselves and learn that they can do anything they put their minds and efforts to.

Amanda Diane Clarke

Asst. Coach - Gold Group LISD


Amanda began her coaching career as a middle school team co-founder at North Hills Preparatory in 2010.  NHP’s MS team won the Metroplex MS Championship meet the second year of its inception.  In her 2ndyear at NHP, she also began coaching the HS team and did so for 3 years.  She remains a MS coach at NHP.  During these early years, it became apparent that coaching swimmers was her passion and so the journey began!  In addition to NHP, she was asked to join the Hackberry Creek Country Club swim team in 2014 as an assistant coach.  She became head coach of this program mid season.  She remained at HCCC until the summer of 2017. She also joined The Greenhill School’s MS and HS coaching staff in the fall of 2015 and continues to be a part of that program.  Facilitating the Swim and Bike Summer Camp program at Greenhill began in the summer of 2017.  

Amanda is excited to be coaching with her friend and mentor, Sean Sell.  As a swim mom to her daughter Sarah Clarke, Amanda met Sean in 2012. She soon recognized Sean’s coaching methodology as unique as Sarah excelled in the sport.  However Sarah’s enthusiasm waned when Sean moved from the Mustangs to COPS.  Resolute to swim for ‘her coach’, Sarah followed Sean, moved teams and her love of the sport reignited.  Swimming for Sean, Sarah swam at multiple Sectional meets, became a captain of her high school team and will forever be proud to be a founding member of SELECT. As a coach and a parent, Amanda recognized the positive influence Sean had on her daughter and desired to emulate Sean’s style and approach to competitive swimming.  The stars aligned!  Soon Sean was in the position to hire an assistant for his new, dynamic team and in 2016, a partnership was born!        

Amanda is a former AAU swimmer, former captain of her HS team and current Masters swimmer.  She lives in North Dallas with her husband Bryan, their youngest dog Paco. When not on deck or in the pool, Amanda enjoys her big family, friends, travel, hikes, music, chocolate, good food and adventure! 

‘The SELECT team and Sean’s tutelage positively influences all other programs I coach.  The future at SELECT is limitless. We have fun and we are FAST!’  ~Amanda

Sarah Grace Lewis

Asst. Coach - Silver/Bronze Group LISD


Sarah first began her coaching career at Stonebriar Country Club in 2013 as an assistant coach. While coaching at Stonebriar, Sarah gained experience teaching proper technique and writing practices for swimmers aged 3 to 17. After coaching for Stonebriar for 4 years, Sarah became an assistant coach on Select. Besides for coaching practices, she also leads the team’s communication and social event planning. Although she loves coaching all ages, her true passion lies in coaching Select’s youngest groups, Bronze and Silver. 

Sarah started swimming competitively on the Brookhaven Country Club swim team. She later joined the Dallas Mustangs, swimming with them for 6 years. She finished off her high school swimming career with COPS (2 years). In addition to swimming on a club team, Sarah also swam with her high school, Bishop Lynch.  Sarah qualified for state all 4 years. 

Sarah attended the University of Kansas and graduated in May 2018 with a Bachelor of Arts in Applied Behavioral Science. She is currently a Master’s of Occupational Therapy student at the Texas Woman’s University Dallas Campus. Sarah is a Red Cross certified Lifeguard and CPR/AED Instructor. 

Julia Walsdorf

Asst. Coach - Silver/Bronze Group CFBISD


Julia began her coaching career in 2016 with the Bent Tree West Swim and Tennis club in Dallas for two summer seasons as the head coach where she learned the ins and outs of coaching; gaining experience on the deck, teaching and improving swim skills, and behind the scenes performing meet entries and networking with other coaches of the league.  She later went on to coach for the Dallas Country Club in 2018 where she further advanced her coaching skills. 

Julia began her swimming career at age 9 with the Dallas Mustangs and continued to swim with them for six years; four of which she swam under Sean Sell. Julia later moved on to swim for COPS under Sean (1 year), to join the Select Team of Aquatic Racers as a Founder member with whom she swam with for two years until the summer after her high school graduation. 

Coach Julia is eager to continue her coaching career with her life-long coach and mentor Sean Sell who has pushed her both in and out of the pool to do her very best and give the task at hand 110%. She recognizes that Sean is no ordinary coach as his advice is not only relevant to the pool but to life in general as well. 

Julia currently attends UTD and plans to graduate with a BA in Global Business. She hopes to take all that she has learned both in class and from her life experiences to both excel as a coach, and a student, as she will never stop striving to acquire knowledge and experience about her current topic of interest. 

Jason Cole

Asst. Coach


Jason grew up in Moore, Oklahoma –learning to swim at age three.  Besides swimming, Jason also enjoyed competing in Football, Track & Field, Baseball, Basketball, and Soccer.  Participation in Varsity football led to offers to compete at the college level, however, injuries forced Jason to hang up the cleats.  

Once in College, Jason returned to the pool –through Coaching, teaching and lifeguard competitions

During his time at Oklahoma State University, Jason coached the Stillwater USAS YMCA Shockers, increasing team membership from 16 to 60 athletes, with 2 back to back State runner-up titles leading to the 1997 State Championship title.  During this time Jason also coached the Oklahoma City Will Rogers Dolfins to the League Championship win, and the Austin TX Westwood Country club Summer League championship title. Jason was the captain of the Oklahoma State Rowing “Crew” team, earning multiple podium finishes, and qualifying for nationals.

After graduating from OSU, Jason began a career in New York.  Where he met his wife and started a family.  From 2005 - 2008, Jason was the head age group coach for the CYO St. Kilian swim team, started a track & field team, and an adult Triathlon training group in Long Island. Jason moved to Plano Texas in 2008, continued training and competing in triathlons, coaching Track & Field and swimming.  In 2010-11 Jason coached color groups for City of Plano Swimmers.  Jason has spent time at the Olympic Training Center in Colorado and has Coaching Certifications from USA Swimming, USA Track & Field, and USA Triathlon.