Coaches & Directors



Coaching Staff


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 one of the board members.

Welcome to O2 Performance

Gilberto Junior

Head Coach - ASCA L4


Coach Gilberto M. Silva Junior (Coach Junior) – Head Coach and swimmer, with over 35 years of swimming experience. 
Coach Junior joins O2 in February of 2015 from California where he most recently was the Head Coach and Founder of the ZEON Performance. Before being ZEON Head Coach, Junior was a Head Coach at Blue Eagle Swim Team in PA (2011-2013), Head Coach at Bradshaw Christian High School (2008-2011), Head Coach at Spare Time Aquatics Sacramento (2004-11), Swim Instructor at Paradise Cove Swim and Dive Center (2006-2008), and Head Coach/Aquatic Director/Founder of Hudson Aquatic Team (1999-2005).
Coach Junior joins O2 with vast experience in staring and growing his teams - having successfully started and grew three swim team from less than 10 to over 100 swimmers as well as initiated two brand new high school swim teams in Northern California; and Pennsylvania 
In addition to his full-time coaching experience, Junior has worked in various capacities with several High Schools, including masters. Junior has coached swimmers that have competed at USA Junior Olympics, Far Western, Western Zones, Sectionals, Grand Prix, Junior Nationals, Nationals, World and Olympic Trials, qualifiers/winners, and had numerous swimmers receiving college scholarships.
“Growing up in Brazil has taught me the values of being patient, focused and hard working. My education and studies in engineering have helped me understand the connections between two points, the importance of streamlining, of building an excellent foundation and looking for the most stable elements to build a successful structure. My desire to build my own successful swim coaching company (Triswimsmart), has helped me to work with athletes of all levels and ages. It has allowed me to study the human body in relationship to the water and to work with world class athletes, young children, recreational swimmers, and beginner triathletes as well as phobic swimmers. These experiences have helped me discover the most effective and efficient way of communicating my philosophy to anyone who wants to learn the sport.”
Coach's Philosophy
I believe in a strong dryland program: stretching, plyometric, med balls, wild rope, slosh pipes, stretch cords, pilasters/yoga, and for those who are ready, Vasa and lightweights.  I have the technical/leadership skills and ability to work with all levels; from novice to nationals, including masters’ swimmers. I also possess extensive practical experience in developing a variety of training programs from sprinters to open water swimmers through techniques and innovations to improve a swimmer’s education, ability, progress and success. My  coaching style consists of the ability to perceive what the swimmer can do, and help them do it better at the right gradient, ideals, passion to help people learn, be confident and having fun. 
My coaching philosophy is based>You Can Do it!

  Coaching Achievements 

  • Top 1, 2, 3 Junior Olympic
  • U.S. Junior Nationals        
  • Top 1, 2, 3 Western Zones
  • U.S. Nationals
  • Numerous USA Sectionals Winners
  • U.S. 5KM Open Water National
  • Top 3 High School Sections/Records
  • International Meet Brazil
  • Top 1 National Age Group Ranked
  • USA Zones Camp
  • Top 3 & LSC Age Group Records
  • Top 3 State Ranked/Records
  • World Trials
  • USA Swimming's Scholastic All-America
  • Olympic Training Center Team
  • US Navy Seals
  Asscoiations & Certifications 
  • (ASCA) - American Swim Coach Association - Level 4
  • (USAT) - USA Triathlon  Member                             
  • (USMS) - US Masters Swimming  Coach - Level 3
  • (ABMN) - Brazilian Masters Sim  Association
  • (WSCA) - World Swim Coach  Association
  • (PADI) - Professional Association of Diving Instructors
  • (USAS) - USA Swimming Coach
  • (NASA) - National Age-Group Swimming Association
  • (USAC) - USA Cycling  Member                        
  • (NISCA) - National Interscholastic Swimming  Coaches Association

Viet Anh Nguyen

Assistant Coach - ASCA L2


Coach VI is ASCA Level 2 and he joins O2 Performance Aquatics in January 2015, coaching Pre-Competitive, Bronze, Silver, Gold and Masters. Before joining O2, he help create the Coppell Crocs swim team in 2008 and became Head Coach. While with Coppell Crocs, he has taken 27 National Qualifiers and 50 State Qualifiers in at Recreational Level. He previously swam for Nimitz High School and holds 7 of the 11 school records. 

  • (USAS) - USA Swimming Coach
  • (TPPC) – Texas Public Pool Council
  • (NTAA) – North Texas Aquatics Association
  • (USMS) – US Masters Swimming Coach
  • (ASCA) – American Swimming Coaches Association – Level 2 Achievement  (Pending Level 4 Education)
  • (LGi) – American Red Cross Lifeguard Instructor
  • (AFO) – Aquatics Facility Operator


75% participation from team at Swim Meets
15% of Team qualifying for Texas Age Group Swimming(TAGS)
10% of Team National level competition


Recognized Coach by NT-LSC 
Become most effective coach and be concerned for Performance Consultant 
Coach swimmers to National level in USA-S


Stop by and say Hello

Nina Lim

Head Age Group Coach


Coach Nina joins O2 Performance Aquatics in March 2016, coaching bronze and silver. Before joining O2, she was an age group coach for Lakeside Aquatic Club in 2015 and is currently an assistant coach for Carrollton Aqua Racers since 2009. She swam with Carrollton Aqua Racers for eight years where her desire to coach stems from.

She swam for Newman Smith High School and was a regional and TISCA qualifier all four years. She is currently a student at University of North Texas, studying for her bachelors in Kinesiology with a minor in biology. 

Swimming is a large part of her life and while she no longer competes, she can’t imagine herself anywhere else but on the pool deck. Her goal as a coach is to help motivate and guide athletes towards achieving their own form of success and goals; whether it be successfully learning a flip turn, being legal in a stroke, or achieving best times. She strongly believes in athletes choosing to be successful, and taking ownership and responsibilities for their betterment with a guiding hand.

Charis Lynn Parker

Assistant Coach


Charis will begin coaching with O2 Aquatics in January of 2017.  Charis has been swimming competitively for over a decade. She has competed at club, scholastic, and collegiate levels.  Charis' swimming resume includes qualifying for the NYS Championships and USA sectionals, a Section III Title, and multiple school records for high school and college. Her specialty is in Breaststroke and the Individual Medley.
Swimming has been and integral part of Charis’ life. She hopes to share her passion for the sport and love of training with those that she coaches. Swimming is an opportunity for people to build fitness, discipline and friendship both in and out of the water. 

her achievments

Scholastic & Collegiate Swimming

At Malone University Women’s Varsity Swim and Dive Team Canton, OH  2013-15 she held School Record Holder in the 100 Breast, 200 Breast, 800 Free Relay, 200 Medley Relay

At Baldwinsville Women’s Varsity Swimming, in? Baldwinsville, NY 2009-2012, she was the Team Captain, State Qualifier, Section III title in the 100 Breast, School Record holder

She has a impressive carrer as a swimmer   

She is>

Coach Parker graduates from Malone University  Canton, OH in August 2016 with Bachelor of Communication Arts: Media/Film/Theater 

Elizabeth Prasse

Assistant Coach


Liz Prasse began her swimming career here in North Texas nearly two decades ago. She swam all the way up through college, earning a scholarship at Colorado State University, where she specialized in mid-distance freestyle, backstroke, and IM. Throughout Liz’s swimming career, she has done every stroke, every distance from earning her first A and TAGS cuts in the 100 breast to her first Sectional cut in the 1650 and first NCSA Junior National cut in the 200 back to being nationally ranked in the 50 fly as a 10-year-old. Most of her club records as an 8 & under and 10 & under still stand today.
 Thus, Liz knows about each stroke and distance with the discipline required for each length of the pool. As team captain of her high school swim team, Liz led the Wildcats to their first District championship in school history. She graduated as MVP of her high school swim team after breaking several school records then went on to earn the Colorado State University Sportsmanship Award her senior year of college, given by the athletic department to the athlete who remains fair, understanding, positive, and motivational, regardless of his or her circumstances.   
  Although she’s no stranger to hard work, Liz Prasse wants others to enjoy swimming as much as she did. Her goal is to make swimming fun for her swimmers so they can become the best they can be inside and outside the water.  
Fun fact: Liz Prasse has worked with some of the greatest swimmers in the world, including Ryan Lochte, Aaron Peirsol, Margaret Holtzer, Cullen Jones, Cammile Adams, Simone Manuel, and Kirsty Coventry.
Coach Liz graduated from Colorado State University with a B.A. in Journalism and Media Communication with Honors in 2017, and more recently, from Southern Methodist University with a M.S.   in Sports  Management the summer of 2018. She is currently interning with the Marketing & Creative Services Team within SMU Athletics in addition to coaching with O2 Performance Aquatics.

Adam Alexandar Macias

Assistant Coach


A little about Adam
Adam Macias  Started swimming when he was 7 years old I swam varsity for
Franklin and Ranchview high schools and was a team caption for Ranchview his senior year
where he broke 5 school records. He swam his freshman year of college at Adam state university a
year later he came back to Dallas to train with coach Junior where he broke two
of his personal best times in the 100 fly and 200 free and am continuing to swim on the O2
performance masters team. Adam currently studying at UNT with hopes of getting his major in
Business Finance with a minor in kinesiology.
Adam's Philosophy
As a coach Adam wants to help swimmers to achieve their goals showing them that it is
possible to achieve their dreams in or out side the pool. Adam believes this sport goes beyond much more
than breaking best times and qualifying for nationals or Olympic trials. Its about creating a goal,
understanding the path you’ll have to take to reach that goal and then perusing it with all your
heart. He Also want his swimmers to understand that this is a team sport! It's not just about what
will make you better but what will make your team better. He wants all his swimmers to feel like they
are part of a family and that after every practice they feel like they have strengthened their team
working skills.
Adam's words
"As a recent former swimmer I have made many mistakes in my own training and
have learn from them, although I have also felt the pure joy of accomplishing something that you
may never have thought was possible! There is truly no other feeling like it! This sport will not
just make you a better athlete, but it will make you become a better student, co worker, leader
and strengthen your confidence in your self and help you keep setting higher and higher goals
and motivated you to keep pushing your own limits above and beyond.
“Never say never, because limits like fears, are often just and illusion.”
~ Micheal Jordan
Adam's goals for his swimmers
1.) to help swimmers understand who they are as swimmers
2.)to help swimmer break though mental and physical challenges and fears
3.) to create good training habits
4.) to have swimmers make consistent and longterm progressions in their strokes
5.) and of course help them be that fastest they can be!!! And reach their individual goals!

Juliano Ciruelos

Masters Coach


Coach Juliano is The Masters and Pre Comp Coach

He believes Perseverance is the quality that allows someone to continue trying to do something, even though it is difficult. This is valid for all aspects of our lives. In triathlon this is what makes someone excel and have a long life in the sport.

He sees in triathlon a lifestyle. It makes us pursue a healthy and balanced life, but also challenges us to the best of our abilities. The steps for success in sports, according to running coach Dr. Jack Daniels, are inherent ability, motivation, opportunity and direction. The last>

His coaching philosophy is based>

His role as a coach is to help you, inspire you and guide you through the process of training. "My job is to establish a healthy coach-athlete relationship and together, determine the best course of action with your best interests in mind".

As a coach He likes to be present in the training sessions as much as possible. By doing so, He can analyze his athlete’s progression, see where they need improvements, observe overall state, and then, if required, adjust the planned session to their needs.

Juliano was born in Brazil and in 1997 I graduated in Aeronautical Sciences, which helped me achieve his youth dream to become an airline pilot. In 2000, due to his job, He started training triathlon as a way to be fit for flight and to make new friends. At Amaral Triathlon in Curitiba, Brazil, His coaches, His wife and friends inspired him to achieve more than he could expect. In 2003 he qualified for Ironman Triathlon World Championship and in 2006 he finished Ironman Brazil with a PR of The love for the sport took him in 2007 to pursue His BS in Physical Education. At the college, for 3 years, Juliano participated in several projects as assistant coach, working with beginners and all level swimmers, runners and triathletes. 

In 16 years of endurance sports He participated in races, from sprint to Ironman, 5K to marathon, and also in relays of different formats. 

Here in DFW area He has been coaching for Triple Threat Tough Tri Club in Plano, TX. 

Hes Best Quote: "In the dust of defeat as well as the laurels of victory there is a glory to be found if one has done his best." — Eric Liddell


Coach Juliano has a Impressive Background



       USAT – Level 1 Coach certification           

       Ironman Certified Coach


       CPR/AED AHA

       IRONGUIDES Coach certification

       CBTri - Coach certification



He played several sports during my youth like soccer, judo, jiu-jitsu and tennis. In 2000, He started in triathlon and since then Juliano completed approximately 40 races in triathlon (sprint to Ironman) and running (5k to Marathon). His athletic highlights are the Ironman World Championship in 2003 and a PR of 9:27 in Ironman Brazil 2006.

       Ironman Brazil 2006 - 9:27

       Ironman World Championship 2003 - 10:22

       Pirassununga Long Distance Triathlon 2002 - 4:20

       Santos Internacional Triathlon 2007 - 1:58

       Caioba SESC Triathlon 2007 - 1:03

       Curitiba International Ecological Marathon 2007 - 3:07

       Rio de Janeiro Half-Marathon 2014 - 1:28

       Stonebridge Ranch Sprint Triathlon 2015 – 54:54

Karen Robertson

Master Coach


Karen started her athletic career when she was around 13-14 years old. She started gymnastics at the local YMCA and moved into the competitive program until she reached High School. She competed at the High School level and received a scholarship to Lamar University where she competed all around there for a year.

Karen was always active by going to the gym and even kept up her tumbling into her Thirties. She eventually started coaching gymnastics from toddlers to competitive A & B team girls.  she then became certified to judge gymnastics meets from 9-10 year old all the way up to the High School meets. That was in 1987-1993. In the mean time she also started running in 1988 and did her first triathlon in 1991 in Midland Texas which consist of a 1k swim in the 50 meter outdoor pool and the bike was 18 miles and run was a 10K.  Karen did a few more triathlons after that locally from West Texas to Southeastern New Mexico. When moving to DFW, she found a Masters Program and that is where she really began to learn to swim. she started with North Lake Masters program about in 2005 and have been a member ever since. she have done numerous triathlons in the 29 years and off-road triathlons starting about 2002 until present. Karen even competed in a few mountain bike races and ultra distance races which last anywhere from 4-6 hours. Karen has earned:

All American Rankings in USAT

National Xterra Lake Tahoe 2002 - 1st Age Group (qualified for world championship in Maui)

6th Age group 2002 Maui

Xterra World Championship 2003 - 2nd place Age Group

Many awards from 1-3 Overall, Age Group, Regional and State Ranked in top 3, Masters, and now Grand masters winner

Since all of her experience with training and racing, Karen has learned a lot about herself even when aging she has learned her limitations of knowing one cannot continue to do what one did 15 or 20 years ago. She is glad she can still have triathlon part of her healthy lifestyle and able to balance family and work along with still competing after all these years and being on the podium still.

Karen is a Mother of 2 girls and 4 grandchildren from ages 4-9 and works as a Massage Therapist for 19 years self employed.

She has come to really like swimming and have enjoyed learning the challenge of learning the other strokes besides freestyle. It is just another challenge that has made me a better swimmer she believes. She wanted to give back to the sport so she could help out those just beginning triathlon or those that just want to swim for fitness and those that want to be challenged for a good workout.

Karen Certifications 

USA Triathlon Member for 30 years

Level 1 and 2 US Masters Coaching Certificate

Margaret Watson

Yoga Instructor


Margie is a native of Virginia but has been living in Colleyville, Texas since 1997.  After teaching high school for 33 years, Margie decided to continue her devotion to teaching by becoming a registered Yoga Teacher (500 RYT) with Yoga Alliance. Margie is currently teaching yoga at Sacred Soul Yoga Studio in Hurst, Texas and teaches yoga to the O2 Aquatics Performance Swim team as part of their dry land training.  Margie’s passion is to share yoga with as many people as possible in a non-judgmental, non-competitive setting.  Her philosophy is that if you can breathe, you can do yoga!

In addition to her love for yoga, Margie’s other passions include working with her registered therapy dog, Bailey, for the Paws Across Texas (PAT) organization, playing tennis, and spending time with family and friends.  


  • 200-hour teacher training at Lifetime Fitness Academy, December 2014 
  • 300-hour teacher training at Yoga Forte Teacher-Training School, December 2016   


Ingit Chandrawat

Yoga Instructor


Motivated Yoga Instructor with advanced training in yoga. Enjoy inspiring others to improve wellness and commit to long term health and fitness goals.

Completed a comprehensive 200 Hours of Yoga Instructor Training Program from Dhyana Yoga Center, February 5, 2017. Taught a class of 15 kids in Radhaswami Temple in Valley Ranch

At present, working in The Highlands School, Dallas as Assistant Teacher in pre-kindergarten.  In past, worked as substitute teacher in a number of schools that include The Highlands, Dallas; North Hill Preparatory, Las Colinas; and other Uplift Education affiliated schools in DFW area. Taught classes from kindergarten to fifth grade.

Have a bachelor degree in civil engineering from SIT, Tumkur, Karnataka in India  

O2 Board of Directors

Michael Agar



Don Blackard

Vice President


Patricia Yue