PE Instructors

Find Instructor by Last Name

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Tia Lillie || Stacie K. Lonaker


Phil Marrone


Tamar Petrosian



Tom Sarsfield || Bernardo Tapia || Matthew Thornton


Todd Vas Dias

Tia Lillie

Tia Lillie

Tia joined the department in 2013 as the Assistant Director for Physical Education after working as the Recreation Manager and Physical Education Instructor at Caltech. Prior to Caltech, she was the Coordinator of Health Promotion and Education at Saint Mary’s College of California. Tia holds a Doctorate in Exercise and Sports Science from the University of Utah with a focus in Exercise Physiology and an emphasis in Health Promotion and Education. In her free time she enjoys running, indoor cycling, hiking and spending time with her family and friends.

Stacie K. Lonaker

Instructor – Swimming


Stacie introduced the Overcome Fear of Water Class in 2009. She has previously been a beginning, advanced beginning and intermediate swimming instructor. She earned a M.A. and B.S. in Kinesiology from San Jose State. She is also a Miracle Swim Institute Trained Instructor.

Phil Marrone

Instructor – Golf


In the past 27 years, Phil has taught golf at Stanford in PE and Rec classes, Tech Camp and private lessons. Phil has been the Assistant GM/Head Professional at Stanford for the last 17 years. He has been a PGA member for 24 years and has run numerous PGA clinics and seminars. He attended St. Francis High School and Boise State University. Presently, he coaches the boys and girls golf teams at St. Francis High School. In his free time, he is the bassist/guitarist in the popular San Jose rock band BentPeter. He once played “The Longest 9 Holes” – San Francisco to LA in 17 days on foot in 1974.

Tamar Petrosian

Instructor – Fitness


Education and Certifications:
• San Jose State University, B.S. in Kinesiology
• USA Weightlifting

Training Philosophy:
Exercise improves quality of life by expanding clarity, and giving peace of mind, energy and happiness. Through an exercise program you learn consistency, dedication, hard work and determination in order to reach your goals. I love helping people find enjoyment in movement, and realize the excitement and spark it can create. Having a healthy, fit and strong body is such an important part of life and my goal is to help people not only realize this, but also notice how it affects the rest of their lives.

• Strength training
• Weight Reduction
• Sports Specific Training
• Injury Prevention
• Core Strength and Development

Tom Sarsfield

Instructor -Tennis


A respected USPTA teaching professional, Tom is the director of the Whitlinger & Sarsfield recreation tennis programs. He is a graduate of San Jose State University in Physical Education and began his coaching/ teaching career in 1981 with stints at the Almaden Swim & Racquet Club in San Jose, Saratoga High School, and has been involved with the Stanford Tennis Program since 1987. He was nationally recognized in 2002 as a member of the first USTA All-American Team for his contributions in growing the game of tennis.

Bernardo Tapia

Instructor – Fit 2 Run

Bernardo Tapia

Bernardo is the Assistant Fitness Manager for Recreational and Wellness Programs and LKSC Fitness Center, a father and endurance athlete. He joined the Stanford Rec team in 2008 after having graduating from UC Berkeley with a degree in Political Science. Before coming to Stanford he worked in law for 7 years. A Bay Area native Bernardo enjoys running and biking all over the Peninsula and Santa Cruz Mountains on the weekends as well as providing coaching programs for local races. Bernardo competes regularly in running events and triathlons. At Stanford Bernardo is a ‘go to guy’. In addition to running the medical school fitness center he assists with the running of the fitness programs as well as being a running coach and certified personal trainer. In 2008 he started Fit2Run, a running group, that focuses on instructing all levels of fitness to run and participate in 5K’s to Marathons. In addition Bernardo has taught many group fitness classes including Boot Camp, Cross Training, TRX, Walking for Fitness and Wellness on Wheels. His fitness philosophy is to stay active everyday. Bernardo’s son, Dominic, works for Stanford at the All Sports Camp and goes to Sonoma State.

Matthew Thornton

Instructor – Tennis


Matthew Thornton began teaching tennis at Stanford in 2011 following coaching stints at Mission College, Decathlon Club, and San Jose State University. Additionally, he has taught basketball, golf, badminton, soccer, softball, swimming, and volleyball classes at the youth, high school, and collegiate level throughout the Bay Area. Thornton is a certified USPTA teaching professional and an active USTA adult tennis player. Prior to his addiction to tennis, Thornton played competitive basketball and intercollegiate golf at Holy Names University. On the weekends Thornton can often be found at Special Olympic events or paling around with his five little nephews.

Todd Vas Dias

Instructor – Sailing

Vas Dias

Todd Vas Dias first started teaching sailing at the University of Hawaii in dinghies and then keel in boats. He has been a US Sailing certified instructor since 1998. Todd has been teaching for Stanford University’s summer sailing programs for the past 3 summers, instructing both beginner and intermediate sailors from 8 to 68 years of age. Todd loves to see the joy and thrill people experience as they learn to use the wind to glide swiftly over the water. Todd has extensive sailing experience cruising between the Hawaiian islands and within the San Francisco Bay. He is also an accomplished surfer, who has surfed Maverick’s and dozens of other surf destinations all around the world.