Diron Cassidy

PT, MPT (Owner)

Diron Cassidy, PT, MPTDiron Cassidy is a vestibular specialist with more than 20 years of experience treating people with vestibular, neurological and balance-related diagnoses. He is also a Board-Certified Clinical Specialist in Geriatric Physical Therapy.

He has successfully completed a series of APTA Vestibular Rehabilitation Competency Courses at Emory University and Duke University and has extensive education in his areas of expertise. Diron currently spends his clinical time treating patients recovering from concussions and complex vestibular issues.

As the clinical director, he oversees the physical therapy program and consults on cases as needed. He works closely with the Vortex team to develop their vestibular and geriatrics expertise and prioritizes continuing education. This includes staying on top of the latest clinical research and attending advanced courses and professional conferences.

In his free time, Diron enjoys fishing with his kids and watching the San Francisco Giants and San Jose Sharks.

Professional Certifications and Competencies

  • ImPACT Trained Physical Therapist, Concussion Care- ITPT (2019)
  • APTA Cervicogenic Dizziness Competency Course (2015)
  • Board-Certified Clinical Specialist in Geriatric Physical Therapy (2014)
  • APTA Advances in Vestibular Rehabilitation: Competency Renewal Course (2014)
  • PWR!Moves® certified therapist for individuals with Parkinson’s disease (2014)
  • Certified Clinical Instructor (2013)
  • APTA Vestibular Rehabilitation Competency Course (2006)


  • BS in Physiology, University of California at Davis
  • Master of Physical Therapy, California State University, Long Beach

Darlene Macatangay


Darlene joins the Vortex team with experience in a variety of healthcare settings including acute care, home health, inpatient, and outpatient. While working towards her physical therapy degree, she was employed as a physical therapy aide at a hospital specializing in neurological rehabilitation. This is where she developed her interest in working with people who have had strokes, Parkinson’s disease, and vestibular issues.

She enjoys working one-on-one with people to help them regain confidence in their balance and adopt a more active lifestyle.

Originally from the East Coast, Darlene enjoys spending her free time exploring the Bay Area food scene, rock climbing, and dancing online Zumba classes.



  • BS in Health, Physical Education, and Exercise Science, Virginia Commonwealth University, Richmond, VA
  • DPT, Pacific University, Hillsboro, OR

Brittany Curry


Brittany Curry, PT, DPTBrittany Curry has been with Vortex since 2015. She sees people with a wide-variety of vestibular, neurological and balance issues. In addition to her in-clinic experience, she has completed extensive training and coursework, including successfully passing the APTA Competency Course on Vestibular Rehabilitation at Emory University.

She enjoys educating patients on the latest research and working with people to resolve their symptoms and get back to living an active lifestyle. She continues to take advanced courses in her specialty.

A native of San Jose, Brittany enjoys hiking our national parks, traveling with her husband, snowboarding, and taking spin classes.


Professional Certifications and Competencies

  • PWR!Moves® certified therapist for individuals with Parkinson’s disease (2021)
  • APTA Cervicogenic Dizziness Competency Course (2019)
  • APTA Vestibular Rehabilitation Competency Course (2018)


  • BS in Kinesiology, San Diego State University, San Diego CA
  • DPT, University of Colorado, Denver CO

Leann Nakamura


Leann joins the Vortex team after working in a local skilled nursing facility, rehabilitating people who had recently been hospitalized.

She became interested in balance and vestibular rehabilitation during a clinical rotation when she had the opportunity to work 1:1 with people experiencing dizziness, vertigo and balance issues.

Her goal as a physical therapist is to connect with her patients to provide an optimal healing environment.

In her free time, Leann likes to walk her dogs, cook healthy meals, garden, and clean around the house.

Professional Certifications and Competencies

  • PWR!Moves® certified therapist for individuals with Parkinson’s disease (2021)


  • BS in Health Science, Saint Mary’s College of California, Moraga CA
  • DPT, West Coast University, Los Angeles CA

Cara Cassidy

Office Manager

Cara Cassidy is responsible for managing the clinic, which includes scheduling appointments, answering phones, coordinating with other medical offices, and insurance billing.

As the primary contact for the clinic, she is the point person for questions about our therapy program. If she is unable to answer your questions, she will help you find the answer.

Cara leverages her background in communications and customer service to ensure a positive experience for everyone who walks into our clinic.

When she isn’t working, she enjoys reading, traveling, fostering kittens, and spending time with family.