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Meet the cor team

Dr. Gary John Mullen Physical Therapy Physical Therapist Santa Clara
Physical Therapist

Dr. John Mullen, DPT is a World-renowned expert and speaker in sports training and rehabilitation. He received his Doctorate in Physical Therapy at USC, as well as the Josette Antonelli Division Service Scholarship, the Order of the Golden Cane, and the Order of Areté. At USC, he also performed research on strength training and rehabilitation. Dr. John has worked with over 30 Olympic and Professional athletes, helping them earn over 15 Olympic medals. He was also the editor of the book Swimming Science and was named one of the Best 3 Physical Therapists in Santa Clara in 2018, 2019, and 2020.

His dedication to research and individualization spurred him to open COR in 2011. Since 2011, Dr. John has been featured in Gizmodo, Motherboard, Stack Magazine, and much more.

He has worked with numerous colleges and teams regarding rehab and performance. He has also done sports performance consulting for team China, the Philippines, Trinidad and Tobago and more.

Before his Doctoral program, Dr. John swam on an athletic scholarship at Purdue University. At Purdue, Dr. John was an Academic Honorable Mention All-American and was awarded the Red Mackey Award and R. O. Papenguh Award. He also won the Purdue Undergraduate business plan and elevator pitch competition, as well as 1st prize with the Indiana Soy Bean Alliance.

Dr. John was born in Centerville, Ohio and was a 24-time high school All-American Swimmer. Dr. John is still a swimmer and is a former Masters Swimming World and Pacific Swimming Record.

Dr. Casey Avila
Physical Therapist

Dr. Casey Avila, DPT, is deeply rooted in the vibrant community of San Jose, having spent the majority of his life in the area. A recent graduate of California Fresno State University, he earned both his Bachelor’s Degree in Kinesiology with a specialization in Exercise Science and his Doctorate Degree in Physical Therapy. Returning to his hometown after obtaining his DPT, Dr. Casey embarked on his fulfilling journey as a physical therapist.

Committed to enhancing the well-being of his patients, Dr. Casey focuses on a holistic approach, blending education, self-care strategies, and functional training. His ultimate goal is to empower individuals to reclaim their daily activities or engage in their chosen sports with newfound vitality.

Beyond the realm of physical therapy, Dr. Casey is an avid volleyball enthusiast with a history dating back to middle school. His passion continues to this day by coaching at both Pioneer High School and Fusion Volleyball Club where he trains athletes at the middle school and high school level. Additionally, he finds joy in pursuits such as archery, hosting board game nights with friends, exploring culinary arts, indulging in video games, and cherishing quality time with loved ones.

Abel Sanchez
Dr. Abel Sanchez
Physical Therapist

Abel Sanchez. Grew up in San Jose, CA, and got his undergraduate degree in Psychology from Chico State.

After completing his degree, Abel went back to school to take prerequisite courses for PT school and graduated as a Doctor of Physical Therapy from Rocky Mountain University in Provo, UT. While in Utah, he picked up snowboarding and enjoyed hiking some epic trails on a weekly basis.

His hobbies include boxing, bouldering, and training for Spartan and other trail races. One of his biggest life goals is to complete 50 50k’s (31.1mi) by the time he is 50.

able is passionate about educating patients about human anatomy and biomechanics and loves the look on someone’s face when they realize they are able to do more than they ever thought possible!
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Ebony Robinson
Billing & Office Manager

Ebony grew up in the Bay Area with her mother and sisters. Alongside her family, she spent her time singing, dancing, skating, baking, and performing at fairs. Ebony enjoys focusing on her education and spending time with her nieces and nephews. She studied at Heald College in Computer Business Administration.

While Ebony became more involved with the medical field, she discovered the beauty of massage and its benefits. As she wanted to do more, she dove into the massage therapy course, at the National Holistic Institute in San Jose. With her massage practice, she continues to work towards learning more and pursuing her certification in becoming a Doula.

Ebony has worked in many fields, from sales to marketing, nursing homes, and now finding a home here at COR as our Billing & Office Manager. She works to help others understand their policies and feel comfortable with the knowledge of their financial options to work towards the recovery they need and deserve.

Mason Spivey
Personal Trainer
Mason started his fitness journey by competing in CrossFit. Here he learned the fundamentals of weight lifting, gymnastics,  and aerobics. After competing for four years he decided to become a fitness professional.
His passion took him all over the fitness world! From bodybuilding to mixed-martial arts.
Mason is always striving to learn the most effective training methods to help any individual no matter the goal! He currently competes in USA boxing and knows what it is like to be coached. He is also a certified Nutritionist through both NASM and ISSA. With 10 years of total fitness experience, Mason has the tools and knowledge to help you with any of your fitness needs!
Alan Berkeley
PT Student

Alan is a Bay Area native working towards applying for a DPT at Foothill College. He’s been an athlete his whole life, specifically in soccer and track.

He loves being in the gym and tries to go as often as he can outside of class and interning at COR. Spending time there is how he became inspired to pursue physical therapy. In his spare time, his favorite activities revolve around music listening, and production.

Greg Gimenez, MT
Greg Gimenez
Massage Therapist

Greg Gimenez grew up in California and has been active his entire life. He grew up playing multiple sports, focusing on football and wrestling. He then took up many other activities, focusing on powerlifting and outrigger canoeing.

While Greg was training powerlifters and other athletes, he discovered the importance of recovery and massage. At this time, he dove into massage therapy, receiving Honors at the National Holistic Institute Advanced Neuromuscular Therapy program. With his massage practice, Greg uses a variety of techniques, which include, but aren’t limited to deep tissue massage, trigger point, sports massage, pre/post-event massage, Shiatsu, Lymphatic drainage, and many others.

Greg has worked with numerous elite strength and power athletes, MMA competitors, Canoers/Kayakers, SUP paddlers, swimmers, and many more!

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Cody Chang
Massage Therapist

Cody Chang has immigrated to California for more than ten years. He usually likes mountain climbing activities and a regular lifestyle to keep himself active, and at the same time help others achieve the ultimate goal of life, which is good health.

 he often watches health channels to acquire useful knowledge, and at the same time find various suitable treatment options for integration and application.
He hopes treatment can benefit more people and let more people know about COR.
Sarahi Mesa
Front Desk

Sarah has lived in the bay area for many years, she graduated from Carrington College as a Medical Assistant both in medical and administrative. She fell in love with the healthcare field after attending a course in occupational therapy during her senior year in high school. Sarah is a friendly and caring person, who loves to put a smile on your face.

In her free time, Sarah loves crafting, watching football, spending time with her family, and going bike riding with her husband and their two boys. Sarah is the biggest Disneyland fan, if she had to choose a vacation place that is where she would go in a heartbeat.

Melissa Briones
Front Desk

Melissa grew up in the Bay Area and graduated from MVLA adult school with a certificate in Medical Assisting for clinical and administration. After completing her externship and experiencing firsthand how great it feels to help others she knew she wanted to pursue the medical field further.

Before studying Medical Assisting, Melissa mainly worked in the customer service industry. She still uses those skills to make sure people feel welcome and comfortable when they come into the office. In her free time, Melissa likes to draw, read, and spend time with her family.



  • Strong interpersonal and communication skills.
  • Elite manual therapy skills.
  • Diverse skillset.


  • Certificate in personal training (NSCA or CSCS perferred).
  • Strong networking skills.
  • Driven for excellence.


  • Strong manipulatory skills.
  • Growth mindset.
  • Desire to work with different professionals.

Front Desk

  • Ability to multitask.
  • Very organized.
  • Excellent communicator.