Meet the cor team

Dr. G. John Mullen Physical Therapist
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, 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.

Joseph Ochsner CPT
Joseph Ochsner
Personal Trainer
Joe has been a certified personal trainer with the National Academy of Sports Medicine. He enjoys helping others work towards their performance and fitness goals. He has an associate’s degree in kinesiology and will complete his bachelor’s in physical education at San Jose State University in Spring 2020. Joe has had the opportunity to receive coaching in a wide variety of sports helping him understand how to apply sports concepts to training. Joe plans on pursuing a teaching credential after completing his bachelor’s.
Growing up, Joe was very active and played many sports. Throughout middle school and high school, Joe wrestled and played football. In high school, Joe placed 3rd at the freshmen-sophomore state tournament as a freshmen. Joe was also first-team all-league running back in high school. After enduring various injuries, Joe opted out of competing in college despite being recruited. He attributes some of these injuries to improper training, sparking his interest in personal training. He uses his experiences to individualize each program keeping in mind the big picture, health and performance.
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Andres Uribe
Personal Trainer
As a child Andres has always struggled with asthma. Being sent to the hospital as a child for an entire week due to his asthma restricting him from being able to increase his oxygen and slowly developing Pneumonia made him realize the only true way to help manage the strength of his lungs was to exercise.
Since then, Andres has devoted fifteen years of his life to martial arts, where he was able to not only learn how to defend himself but also how to control his breathing through countless hours of breathing and meditation training. In between those 15 years, Andres has also done multiple sports in high school being a part of the Varsity football, wrestling, cross country, and track and field teams. Andres was also the captain of wrestling and track, which led him to a goal of always being a leader and teacher to others. This led him to now want to help as many people as possible, showing and teaching everything he knows to others to help them succeed not only in sports but also in life.
Andres has been a Martial Art Master instructor for 7 years teaching kids, teens, and adults of all belt levels. He has also been a swimming instructor for 4 years teaching young children that were too scared to even touch the pool water, and kids at a more competitive level.
Now Andres has achieved his goal of becoming a personal trainer with a certification from the National Council on Strength and Fitness and continues to help teach and coach others what he has learned to help everyone achieve their fitness goals just as he has. With his experience through fitness, he helps provide personalized programs for everyone so that they can become the best versions of themselves 110% of the time each and every day.
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Dr. Katrina Kneeskern, FAAOMPT, Cert. DN, Cert. SMT
Physical Therapist

Katrina is a Doctor Physical Therapist offering over 12  years of experience with primary expertise in orthopedic outpatient settings.  She has many skills set include focus on manual therapy, dry needling, myofascial release, postural re-education, dance and sports medicine while incorporating neuromuscular re-education, Pilates and yoga based expertises. Her primary goals are to increase body awareness and incorporate preventative care to help maintain healing for patients by getting to root causes of symptoms. She is deeply passionate and committed to spreading knowledge of health tools and delivering treatments/education to facilitate the overall health and well-being of patients. Faith, Family, Food, Fitness, and FUN! Katrina loves to hike, bike, dance, run, do CrossFit type workouts, cook clean, travel, coffee as well as constantly learn, grow, evolve and teach in all areas of life. Come evolve alongside her in your journey to optimal health and physical performance!

Jennifer Guan Physical Therapy
Dr. Jennifer Guan
Physical Therapist

Jennifer completed her undergraduate degree at USC where she double majored in Neuroscience and Psychology. She then attended Columbia University where she received both a masters in Exercise Physiology and her Doctor of Physical Therapy degree. During her time at Columbia, Jennifer was involved in research evaluating interventions for knee pain as well as pregnancy-related pelvic girdle pain. She is also passionate about teaching and delivered lectures in immunology, kinesiology & biomechanics, pelvic anatomy, and pelvic floor dysfunction.

She became involved in sports at a young age and has had her fair share of injuries over the years. Her love for movement coupled with her experiences with being a patient herself set her on the path towards becoming a physical therapist. Jennifer is a Certified Strength and Conditioning Specialist and has experience working with patients in orthopedics, sports, and pelvic health. Jennifer combines her knowledge of functional movement and pelvic dysfunction to guide her patients towards optimizing their performance and preventing future injury.

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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!

Priscilla Personal Trainer
Priscilla Cromer
Personal Trainer

At the age of 10, Priscilla was watching soccer icon, Brandi Chastain, on TV. This motivating figure inspired Prciscilla to begin her fitness journey. She  enrolled in my local soccer program, but after several seasons of playing she sustained a knee injury that kept her from playing contact sports. She had to shift gears, unable to participate in fitness the way she had known up to this point. At this time, she uncovered weight lifting and through weight lifting, she gained an understanding that all muscle groups whether big or small were crucial in my road to recovery. After making this discovery, Priscilla earned my certification as a personal trainer to help others overcome their fear of reinjuring themselves as well as building their confidence around fitness.  She is a firm believer that everyone should have access to the knowledge and experts that will help them obtain their fitness goals. This passion led her to obtain a business degree through San Jose State University as well as putting her on the road to obtaining a Master’s degree in Kinesiology.

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Tony Householder
Personal Trainer

Tony lettered in three sports in high school- soccer, football, and lacrosse. It was in the dingy high school weight room that he fell in love with weight lifting, but he would not understand how to refine his pursuit of strength until years later. He got my BS in psychology at Allegheny College in Pennsylvania. He played soccer in college, and got into performance fitness while lifting weights in off season training. Over the course of his athletic career, he sustained several broken bones, concussions, and muscle tears, and working with the athletic trainers at his college sparked my interest in physical therapy and sports medicine. He’s now certified in personal training and nutrition coaching, and is considering a career in physical therapy. He enjoys training athletes for performance, but his most rewarding clients are the ones who he can dissuade of the belief that they have lost some ability-whether to injury or age. He’s been coaching since 2017, and his current goal is qualifying for strong first barbell certification. When he’s not pursuing fitness, Tony’s at a recording studio working with artists and podcasters to cut and mix their projects.



  • 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.