Orange Team

Nelson Guiang, PT, DPT

Clinical Director & Physical Therapist

Nelson found out about Physical Therapy when he volunteered at the Los Angeles County + USC hospital in the summer of 2004. There he found out what Physical Therapy is all about and completely fell in love with the idea of helping people get back to their life while getting to use the various equipment in the gym.

Nelson received his Bachelor’s in Kinesiology with emphasis in exercise science from Long Beach State in 2011. He went on to get his Doctor of Physical Therapy degree at Chapman University in 2015. Nelson completed clinical affiliations with various orthopedic clinics in Southern California as well as experience with working with people with cancer during his affiliation at City of Hope. He did his graduate research on studying the effects of posture-cueing garments on healthy people and hopes that it can be used in the future to help people with their low back discomfort. During his free time, Nelson enjoys spending time with his family, trying new food, snowboarding, and cycling.

Andrew Vertson, PT, DPT, ATC

Physical Therapist

Andrew received his Bachelor’s Degree in Exercise Science from California State University, Fresno in 1991. He then earned his Master’s degree of Physical Therapy in 1996 and his Doctorate degree of Physical Therapy in 2002 from Loma Linda University. In 1996 he also earned his Certification as an Athletic Trainer. He has also completed extensive post-graduate course work in orthopedic manual therapy through Kaiser-West Los Angeles and the Ola Grimsby Institute.

He has more than fifteen years of clinical experience, and extensive continued education in outpatient orthopedic and athletic settings. During that time, he worked with professional athletes from the NFL, NBA, NHL, Major League Baseball, in addition to numerous Olympic gold medalists and movie & television personalities. In his free time, Andrew enjoys cooking, flying as a private pilot, and traveling with his twin daughters, Bailey and Madison.

Kathryn Totheroh, PTA

Physical Therapy Assistant

Kathryn completed her Bachelor's of Arts in dance with option in dance science at California State University, Long Beach. After experiencing numerous injuries over her years as a dancer, she decided to switch careers to physical therapy in order to help others return to the activities they love. She started at Intecore in 2013 working as an aide, received her Physical Therapist Assistant degree with honors from Stanbridge University in 2017, and rejoined the Intecore family as a therapist assistant.

Kathryn is still involved in dance, working part time at the American Ballet Theatre Gilespi School in Costa Mesa. In her free time, she enjoys riding horses, going on day trips throughout Southern California with friends, and cheering on the Patriots.


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