Our Doctors

Mike is a nationally certified Physician Associate (PA) specializing in performance health, functional medicine, and hormone optimization for both men and women.  Before specializing in performance medicine, Mike operated the highest rated primary care clinic in Austin, Texas. Mike has completed over 60 operating room cases in general, reconstructive and orthopedic surgery. He has also completed elective rotations in dermatology and a special rotation working with the Broward County Medical Examiner as a medical expert at accident and crime scenes.

Mike attained a Masters in Education from the University of New South Wales in Sydney, Australia, before beginning his career in medicine. He is currently working towards his DMS – Doctor of Medical Science degree at Butler University.

He is passionate about practicing cutting edge, evidence based medicine and utilizing his education background to help his patients understand the “why”, not just the “what”.

Licenses & Verification:
NPI: Mike_NPI
PA: Mike_PA

Catherine “Katie” Ruffino, PA-C, MPAS Ruffino – License is a nationally board-certified physician assistant with advanced training in regenerative and functional medicine. She earned her Master of Physician Assistant Studies from Marquette University and completed clinical rotations across internal medicine, endocrinology, neurology, vascular surgery, cardiology, pediatrics, and emergency medicine. Katie has extensive experience with regenerative medicine protocols, including platelet-rich plasma (PRP) and ultrasound-guided joint, tendon, and muscle injections. At Stemedix, she works closely with patients throughout their evaluation and treatment journey, focusing on clear communication, holistic support, and continuity of care.

Catherine “Katie” Ruffino, PA-C, MPAS is a board-certified physician assistant who specializes in regenerative and functional medicine. She graduated with her Master of Physician Assistant Studies from Marquette University, where she completed rigorous training in internal medicine, endocrinology, neurology, vascular surgery, cardiology, pediatrics, and emergency medicine.

Katie’s clinical expertise includes regenerative medicine applications such as platelet-rich plasma (PRP), adipose and bone marrow techniques, and ultrasound-guided procedures for musculoskeletal conditions. Her background equips her to support a wide range of patients while emphasizing evidence-informed practice and patient safety.

At Stemedix, Katie plays a central role in guiding patients through their regenerative medicine journey—from evaluation and education to treatment support and follow-up. She is dedicated to providing compassionate, individualized care, helping patients understand their options in clear, accessible terms. Her commitment to excellence and her holistic perspective makes her a valued member of the Stemedix team.

Licenses and Verifications:
NPI: Ruffino- NPI
PA: Ruffino-PA

Board-Certified Pain Management & Regenerative Medicine Physician

Dr. Gerald (Jerry) Mastaw, MD, is a board-certified physician specializing in anesthesiology, interventional pain management, and regenerative medicine. A graduate of the University of Michigan Medical School, he completed his anesthesiology residency and pain fellowship before serving five years in the U.S. Navy, where he led teams in both surgical and trauma settings, including a deployment to Iraq. With more than 25 years of medical experience, Dr. Mastaw combines advanced training with a compassionate, patient-first approach. At Stemedix, Inc., he helps guide evaluations and advanced care pathways, ensuring every patient receives safe, evidence-informed, and personalized treatment.

Dr. Gerald (Jerry) Mastaw is a board-certified specialist in interventional pain management and anesthesiology, based in Florida.

Education & Training

• Dr. Mastaw earned his medical degree from the University of Michigan Medical School in 2000. 
• He completed his residency in anesthesiology at the University of Michigan in 2004. 
• After his residency, he underwent a fellowship in interventional pain management to deepen his expertise in pain-related care. 

Military Service & Leadership

Following his training, Dr. Mastaw served five years in the U.S. Navy. 

• His first duty was at Cherry Point Marine Corps Air Station, where he worked as an anesthesiologist. 
• He was deployed to Iraq (2006–2007) as part of Combat Logistics Regiment 25, serving in a Surgical Shock Trauma Platoon at Al Taqaddum, Iraq. 
• Later, Dr. Mastaw led the Department of Anesthesia at Naval Hospital Rota in Spain. 

Clinical Practice & Expertise

Dr. Mastaw practices both pain management and regenerative medicine as part of his clinical portfolio. He is affiliated with medical facilities in Florida (notably Pensacola and Destin) and is listed in the NPI registry under Gerald Anthony Mastaw Jr., MD. 

He holds an active Florida medical license (ME108549) in good standing. Florida Department of Health

NPI number: https://npiregistry.cms.hhs.gov/provider-view/1316993454

Distinguishing Qualities & Role at Stemedix

As part of the Stemedix team, Dr. Mastaw brings both depth and breadth of clinical insight. His military service, leadership roles, and multi-disciplinary training allow him to approach patient care with discipline, rigor, and a commitment to safety.

At Stemedix, his role underscores the organization’s emphasis on combining clinical prudence and evolving therapies. His background in both anesthesiology and interventional pain management positions him to integrate procedure-based expertise with nuanced patient assessment.

Because Dr. Mastaw has navigated high-stakes environments—whether in military settings, surgical care, or private practice—he understands the importance of consistent standards, clear communication, and accountability at every decision point.

Dr. Khuram Adnan Khan, DO is a board-certified anesthesiologist practicing in South Florida. He holds active Florida license OS11723 and began practicing in 2008 MQA Internet+. His training includes a fellowship in cardiothoracic anesthesia and a residency in anesthesiology. At Stemedix, he contributes his expertise in procedural anesthesia, ultrasound-guided techniques, and ortho biologics, helping bridge additional care with advanced therapies. Stemedix

NPI Number:
https://npidb.org/doctors/allopathic_osteopathic_physicians/anesthesiology_207l00000x/1982865671.aspx

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Dr. Khuram Adnan Khan, DO is a board-certified anesthesiologist based in South Florida with extensive experience in perioperative, cardiothoracic, and interventional care. He holds an active Florida license OS11723 and has been practicing since 2008. MQA Internet

After completing his osteopathic medical degree at Nova Southeastern University in 2006, Dr. Khan pursued internship and residency training in anesthesiology at Rutgers / Robert Wood Johnson University Hospital in New Jersey. He then completed a fellowship in cardiothoracic anesthesia to deepen his expertise in managing complex operative and intraoperative care. 

Dr. Khan is affiliated with hospitals in Florida, including HCA Florida facilities, and holds staff privileges at Northwest Medical Center, Margate, FL. His practice covers both hospital and outpatient settings. 

At Stemedix, Dr. Khan brings his procedural and anesthetic insights into the integration of regenerative medicine: he works on regional anesthesia, ultrasound-guided nerve block techniques, ortho biologics, intrathecal protocols, and procedural pathways that combine safety and innovation. He is also trained in regenerative methods such as adipose- and bone-marrow–derived therapies and PRP (platelet-rich plasma).

Professional & Credential Highlights:

• Licensed DO in Florida (OS11723), clear/active status. 
• Board certification: American Board of Anesthesiology in Anesthesiology. 
• Training: Internship, residency in anesthesiology, fellowship in cardiothoracic anesthesia. 
• Hospital privileges: Northwest Medical Center, Margate, FL. 

Dr. Khan’s philosophy blends technical precision with patient-centered care. He emphasizes clarity, safety, and the thoughtful integration of evolving therapies. His role at Stemedix underscores the bridge between advanced procedural medicine and regenerative innovation.

Dr. Adam Gorberg is board certified by the American Board of Anesthesiology. He began his studies at the State University of New York at Albany, graduating Summa Cum Laude with Bachelor of Science degree in Biology. He received his Medical Degree from New York Medical College. Dr. Gorberg performed his medical internship at Danbury Community Hospital (a Yale affiliate) and then went on to complete his anesthesiology residency training at Westchester Medical Center, located in Valhalla, N.Y.

Dr. Gorberg was awarded the Air Force Health Professions Scholarship. He served the Air Force on active duty from July 2010 to July 2014. As a general anesthesiologist, he deployed to Afghanistan and served at ROLE 3 hospitals in Bagram and Kandahar, Afghanistan. As a specialist in trauma medicine, he took care U.S., NATO, and local nationals. For his exceptional service during Operation Enduring Freedom he was awarded the Meritorious Service Medal.

Dr. Gorberg’s professional medical background includes being proficient in neuraxial, intra-articular and peripheral nerve blocks and injections. He is facile with ultrasound and stimuplex (electrical impulse) techniques. His focus has evolved from management of trauma patients to aiding patients with neurodegenerative diseases. After losing his father to a difficult battle with Multiple Sclerosis, he has made it his mission to alleviate pain and suffering and to improve the quality of life for those with progressive and advanced neurological disease.

“I believe that we live in a great time in history, where we can alter and scale back the progression of neurodegenerative illness. I am honored to be able to play a small role in giving back to you your independence and helping you live a more comfortable and enjoyable life. My wish for you, as a patient of Stemedix, is that you have better and more effective treatment options than my father did while he was struggling with his illness.”