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CPMNF Professional Staff
YiLi Zhou, MD, Ph.D.
Harvard-Trained, Board-Certified Pain Specialist and Neurologist.
Dr. Zhou graduated from Wenzhou Medical College, China in 1982 with training in both modern western medicine and traditional Chinese medicine. He had neurology fellowship training at Shanghai Medical School, specializing in EMG/NCV and evoked potential studies. He served as an attending neurologist in China.
Dr. Zhou came to the USA in 1991. He obtained Ph. D. degree in psychology at Kent State University. He then went to Hahnemann University in Philadelphia, where he served as a chief resident in neurology and worked with Dr. Robert J. Schwartzman, a world renowned RSD expert. Dr. Zhou joined MGH Pain Center, Harvard Medical School in year 2000 as a pain fellow, where he further enriched his skills in interventional pain management. Dr. Zhou then served as the Director of Jackson Memorial Hospital Outpatient Pain Clinic in University of Miami from 2002 to 2004, where he trained many neurology and anesthesiology residents and pain fellows. He was also the Medical Director of Alternative Medicine Program at University of Miami. Dr. Zhou came to North Florida and founded Comprehensive Pain Management of North Florida in 2005. Currently Dr. Zhou also serves as a Courtesy Clinical Associate Professor at the University of Florida.
Over the last three decades, Dr. Zhou has successfully treated thousands of patients with various neurological and pain conditions. He has been involved in multiple research projects and has published extensively in clinical neurology, neuroscience and pain medicine. Dr. Zhou has lectured extensively in neurology and pain medicine in many universities in the US and in international pain meetings.
Dr. Zhou is Board Certified in Pain Medicine, Neurology and Psychiatry. He is the winner of the Distinguished Physician Award by the Florida Medical Association in 2004, 2006 and the Physician Recognition Award by the American Medical Association in 2003.
Stephen Irwin, MD, MBA
Dr. Irwin is a Board Certified Pain Specialist and Anesthesiologist with expertise in Interventional Pain Management. He is a long time resident of the state of Florida and graduated from the University of Florida in 1997 with a degree in Microbiology.
Dr. Irwin attended the University of South Florida and obtained the dual degree of M.D. M.B.A. in 2003. He completed his anesthesiology residency in 2007 and finished an interventional pain fellowship in 2008 from the University of Texas Southwestern in Dallas, TX. Dr. Irwin has worked as a faculty instructor at a cadaver course while in fellowship, instructing doctors from around the country on new interventional pain techniques. Dr. Irwin joined Comprehensive Pain Management of North Florida in December 2008. Dr. Irwin is also a proud fan of the University of Florida.
Bohdan Warycha, MD
Dr. Warycha is a Physical Medicine and Rehabilitation Physician. He graduated from New York University in 1997 with a degree in Biochemistry. He then decided to pursue a career in medicine, and graduated from Ross University School of Medicine in 2002.
Dr. Warycha spent two years in a General Surgical Training Program in New York and subsequently went on to complete his Physical Medicine & Rehabilitation Residency Training Program at SUNY Downstate Medical Center in Brooklyn, NY in 2009. Dr. Warycha served as chief resident during 2008-09.
He proudly joined Comprehensive Pain Management of North Florida in September 2009.
Asha Vishnagara, PA-C, MMS, MS
Mrs. Vishnagara is a NCCPA certified physician assistant and is licensed by the Florida Department of Health. After pursuing a Bachelor’s degree from Fairleigh Dickinson University in New Jersey, she went on to earn a Master’s in Biology.
Shortly thereafter, she moved to Florida where she was working with the University of Florida doing clinical research. After some time, she went on to Nova Southeastern University to pursue a career in medicine. She successfully completed their Physician Assistant program in August 2007 earning a Bachelor’s in physician assistant studies and Master’s in Medical Sciences. She then joined the CPMNF team in March 2008.
Angela Luo, PA-C, MS
Ms. Angela Luo is a NCCPA certified physician assistant and is licensed in the state of Florida Department of Health. She received her Bachelor degree of Biology from University of Mississippi in 1996 and Master degree of Nutrition and Dietetics from Louisiana Tech University in 1999.
She worked full time as a clinical dietitian for 7 years before she pursued a career in medicine. She completed her physician assistant training from Barry University in December 2008. She then joined the CPMNF team in February, 2009. She also has an associate certification in Controlled Substance Management by American Society of Interventional Pain Physicians.
Matthew Barnes, PA-C
Mr. Matthew Barnes is a NCCPA certified physician assistant, licensed with the state of Florida Department of Health. He received a Bachelor degree in Psychology from University of Florida in 2002. He completed his physician assistant training from University of Florida in 2008.
He joined the CPMNF team in February 2009. He also has an Associate Certification in Controlled Substance Management by American Society of Interventional Pain Physicians.
Gail Arthur

Ms. Arthur is treating a patient on IDD machine
Gail Arthur is a Florida State Licensed Massage Therapist. In 1999, she graduated from the Bhakti Academy in Clearwater, Florida, completing a 500 hours program. Gail received her State and National Certification and has remained in good standing as a member of the Florida State Massage Therapy Association since 2000.
By 2001, Gail opened a private practice in the Brandon/Tampa area, specializing in relaxation and energy work. However, she believes in tailoring massage toward the individual needs of each client by using multiple modalities to get the best results possible. Gail continues to work with each individual as well as other therapists invariably refining her skills.
Gail relocated to the Lake City area in 2006 where she has been successfully practicing massage therapy. Additionally, she is employed by Comprehensive Pain Management and has expanded her training to include the IDD machine.
Ms. Arthur believes in continuing education and is always willing to expand her knowledge. With her nurturing touch, she has had many happy, satisfied clients over the years, some of whom she still keeps in touch with to this day.
Quick Links
Dr. Zhou’s publications
Dr. Zhou’s lecture
Patient testimonial