At Sienna Wellness Institute we offer a wide variety of services to better serve the community.

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About Us

While the urban regions work to provide health care to their indigent citizens, rural areas are facing a constant shortage of physicians. Remote areas are always looking for doctors willing to set up their offices in these areas of the country. For Dr. Robert Gross, DO, a 1998 alumnus of Michigan State University, the idea of moving to the Lake Isabella, California area and setting up a clinic was an easy sell. “Every morning I drive to work on the side of a mountain overlooking this beautiful pristine lake,” said Dr.Gross. “I’m in awe every time I see it.”. In November 2008, Dr. Gross and his wife Dr. Holly Spohn-Gross, DPM, also a MSU graduate, opened Sienna Wellness Institute. “The institute was designed with preventive care in mind,” explained Dr. Spohn-Gross. “In addition to podiatry, we also offer cardiology, gastroenterology and laboratory services by LabCorp. One of the things in mind when building Sienna Wellness Institute was to think of what would make the patients more comfortable while in our waiting room, so we gave it a relaxing Mediterranean décor that feels less like a medical facility. You’d be amazed at how much it lowers patient’s blood pressure!

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Years Open


Patients Treated

Career Oportunities

Current Open Employment Opportunities
Full Time
  • Documents patient care by charting in patient and department records.
  • Clinical Skills
  • Physiological Knowledge
  • Pain Management

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Full Time
  • Ordering and performing diagnostic tests and procedures
  • Physical Examinations
  • Interpreting Medical History
  • Chronic Illnesses

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Please call the Office Manager at (760) 379-8630 Ext 27 for more details.

“We encourage our staff to learn as much as possible, to have positive attitudes and outlooks, and to know that this is more than just a job.”

- Dr. Holly Spohn Gross, DPM

Contact Us

Sienna Wellness Institute and Sienna Podiatry can be reached during normal business hours. If you have a life threatening emergency, please dial 911 or go to your nearest Emergency Room. If you have questions about our services, accepted forms of insurance, our facility, or our physicians, please feel free to contact us during normal business hours or use the form below and we will respond within one business day.

NOTE: Use this form for non-urgent, non-medical questions or comments. Messages sent via this form are not secure and should not contain personal health information.


Phone: (760) 379-8630

Fax: (760) 379-7658

Hours of Operation

Monday - Friday: 8:00am - 6:00pm

Saturday - Sunday: Closed

“The good physician treats the disease; the great physician treats the patient who has the disease.”

- Sir William Osler, MD