OUR PROVIDERS




Cary Fitchmun, M.D.

Since he was a child, Dr. Fitchmun wanted to be a doctor. Now that he has been in practice for 14 years, he still looks forward to every new work day. Dr. Fitchmun believes that to diagnose and treat patients effectively, a doctor must not only have excellent examination skills but must also take time to listen compassionately and attentively. The best outcomes happen when patients actively participate in maintaining their good health, preventing illness, and controlling disease. To do that, he provides patients with solid medical information and treatment plans that are aligned with their needs and goals so they can make the best possible health care choices.

In 1993, Dr. Fitchmun graduated from UC Berkeley with honors and then attended UC Davis School of Medicine with a Regents Scholarship. After completing his residency in 2002, he joined Arroyo Medical Group and currently serves as medical director. He maintains board certification in Family Medicine, and is an active member of The American Academy of Family Physicians and the California Academy of Family Physicians. His areas of expertise include:

  • Dermatology and Skin Cancer treatment
  • General Adult Medicine
  • Preventive Medicine

Happily married with two children, Dr. Fitchmun also enjoys surfing, swimming, hiking, and traveling in his spare time.






David Ruiz, M.D.

Dr. Ruiz earned his Bachelor of Science degree from the University of Redlands in California and obtained his medical degree from the University of California, Los Angeles. He stayed in Los Angeles to complete a three-year Family Medicine Residency Program at White Memorial Medical Center.

He and his wife moved to the Central Coast to raise their three boys twenty years ago. He enjoys exploring the outdoors, hiking, fishing, and biking. Dr. Ruiz plays the guitar and sings in his church choir. Continuing his musical interests, he has sung with the San Luis Obispo Vocal Arts Ensemble for seven years.

As a Board Certified Family Physician, Dr. Ruiz provides high quality medical care with an emphasis on prevention. He works closely with his patients to help them achieve and maintain healthy habits to nurture mind, body, and spirit.





Dewey Sandberg, M.D.

Dewey Sandberg, M.D., has been practicing Family Medicine on the Central Coast since 1992, and with his partners at Arroyo Medical Group for over ten years.

Originally from Spokane, Washington, he grew up in Santa Clara, California. He attended Stanford University, earning a Bachelor of Science degree in 1979. With a number of career choices before him, and with the influences of the lives of important mentors in his life, he chose to pursue a career in Medicine. He was admitted to the California College of Medicine at UC Irvine, and graduated in 1984. The many experiences in medical school, covering all medical specialties, prompted him to choose to enter Family Medicine. He entered the Family Practice residency at UC Davis Medical Center in Sacramento in 1984.

With the guidance of some remarkable physicians over these years, he developed a deep commitment to the concept of ongoing doctor-patient relationship, with emphasis on preventive medicine, and personalized care in promoting wellness, as well as in treating disease.

He and his wife, Debbie, have been married for over 30 years, and count their two grown sons as their greatest blessings. They both had the privilege of growing up in this town and attending Cal Poly in their chosen fields of software engineering and graphic communications.

Now, after almost three decades of the practice of Family Medicine, he has the privilege of living and working in this beautiful part of California, with a group of physicians and staff that share the same strong desire to give every one of his patients the attentive and highly competent care that he would want for his own loved ones. It is the daily aim of everyone at Arroyo Medical Group to reach that goal.





Ernest Jones, M.D.

Dr. Jones earned his Bachelor of Science in Chemistry at Brigham Young University and obtained his medical degree at University of Utah, Salt Lake City. He completed his internship and residency at Silas B. Hayes Army Hospital, Fort Ord, California. Dr. Jones is an avid bicyclist. He has participated in the Highway 1 100 mile ride the last few years. His hobbies include gardening and photography. He is married and has seven children and enjoys spending time with his family and grandchildren, and traveling as time permits.





Megan Malzone, M.D.

Dr. Megan Malzone comes to us from Ventana Health, where she has been in private practice for the last 10 years. She completed her residency training at Santa Barbara Cottage Hospital in Internal Medicine. She attended University of Washington School of Medicine where she received her medical degree. She has an interest in women’s health, diabetes, and complex medical issues. She is well known for her personal bedside manner and thoroughness in patient care. Dr. Malzone enjoys traveling, spending time with her family, hiking, yoga and the arts.





Mary Lowery, M.D.

Dr. Mary Lowery started practicing as a board certified Internal Medicine Physician in 1991 when she finished an Internal Medicine residency at Baylor University in Dallas, TX. She started her career in Texas and spent 10 years at the University of Texas at Tyler medical system where she became a Professor of Medicine. She also spent time working at Tyler Internal Medicine Associates, a private group, prior to moving to California. She now practices general Internal Medicine with Arroyo Medical Group, Inc and performs Well Woman Exams as well as Medicare annual wellness exams. She treats a wide array of diseases including hypertension, diabetes, cholesterol issues, thyroid disease and skin disease.

She has a family with two children. She loves the Central Coast area for the beautiful weather and the great people.





Jennifer Owen, MPA-C

Jennifer Owen is a physician assistant who has always had a passion for taking care of people and wanting to help others be healthy. She grew up in Arroyo Grande and is happy to be able to give back a piece of her knowledge and compassion.

She earned her Bachelor of Science degree in kinesiology with an emphasis in athletic training at Cal State Fullerton in 2005. She then worked as an athletic trainer at Righetti High School in Santa Maria, California for two years. Jennifer wanted to be more involved in patient care and disease prevention and decided to return to PA school.

Jennifer attended Rocky Mountain College, Master of Physician Assistant program in Billings, Montana. She graduated in 2010 and was fortunate enough to move back to the Central Coast. She is very happy to be a part of the caring team at Arroyo Medical Group.

Jennifer is a mother of two daughters and is so thankful to be able to balance the joy of motherhood and continue to practice medicine. Their family enjoys the many outdoor activities of the Central Coast and spending time with all of their family that lives here as well.





Marisa Ayers, PA-C

Marisa Ayers joined Arroyo Medical Group, in 2013 and is a valued member of our team. She became a Registered Nurse in 2004, where she specialized in emergency medicine and urgent care. Although she loves being a RN, she went back to school at UC Davis in 2011 to become a physician assistant.

She is married and has three children. She enjoys the outdoors and is active in the extra activities of her children.