About

Leadership at MD Senior Living

Dr. S. Krishnan

MD
Board Certified in Cardiology,
Interventional Cardiology
Principal
MD Senior Living

Dr. Krishnan is a board-certified cardiologist with a subspecialty in interventional cardiology. He serves as a co-founder of both MD Senior Living as well as the group of Valencia Care Homes in Scottsdale. His philosophy is that older adults should lead the most fulfilling life possible with the upmost dignity focusing on their physical, mental, and spiritual well being.

Jeff Geidt

Jeff Geidt

Co-founder, MDSL
Principal / Managing Partner,
MD Senior Living

Jeff received his undergraduate education at UCLA and earned his MBA from the University of Phoenix. In his previous work he managed a $14 million industrial packaging company before transitioning into the senior healthcare industry. Jeff is currently co-owner and manager of Endeavor Senior Care, Scottsdale’s largest in home care provider of one on one care solutions. Jeff also founded and manages the North Scottsdale Retreat and co-manages the Valencia Home, both 10-Bed RALs. He lives in Phoenix with his wife and three kids.

Dr. Mel Ranat

Dr. Mel R

M.D.
Board Certified in Family Medicine & Geriatrics
Principal
MD Senior Living

Dr. Mel is a board certified physician specializing in Family Medicine with a special emphasis on Senior and Geriatric care. Dr. Mel works primarily as a hospitalist as well as a busy aesthetics medical practice. She brings warmth and compassion to our homes and utilizes evidence based medicine in approaching treatment strategies for our residents. Dr. Mel believes in her motto with a vision of improving care and safety culture at our homes: "Elevate Yourself. Elevate Others."

Drs. Reyes & Collazo

Board Certified Nephrology
Board Certified Pulmonary Critical Care
Principal
MD Senior Living

Dr. Reyes & Collazo met in Tampa during their medical training at the Univ. of South Florida and share a belief that the key for a healthier fuller life is with prevention. Dr. Reyes specializes as Nephrologist caring for patients with kidney disorders. Dr. Collazo cares for patients with Pulmonary and Sleep Disorders as well as managing critically ill patients. Both believe in quality over quantity medical care and their combined vision and passion will allow our residents to live a more fulfilled life.

Dr. Arnaldo Velez

M.D.
Vascular Neurologist
Prinicipal
MD Senior Living

Dr. Velez cares for patients with urgent medical needs such as stroke, and abnormal conditions affecting the blood supply to the brain and spine. He earned his medical degree in Puerto Rico and completed a neurology residency in NJ, followed by a vascular neurology fellowship at University of Florida-Shands Hospital in Gainesville. Dr. Vélez encourages his patients and family to learn the signs of an acute stroke and seek medical treatment immediately if they believe they are having one. He passionately believes in one of Dr. Atul Gawande’s quotes, that says: “We’ve been wrong about what our job is in medicine. We think our job is to ensure health and survival. But really it is larger than that. It is to enable well-being. And well-being is about the reasons one wishes to be alive.”

Dr. Liz Treynor

M.D.
Anatomic & Clinical Pathologist
Principal
MD Senior Living

Dr. Treynor is a double Board Certified Anatomic & Pathologist in practice at the Washington Hospital in the San Francisco Bay Area. Practicing for over 20 years, she graduated with highest honors from USC-Keck School of Medicine in 1996. She subsequently completed her Pathology residencies, as well as two fellowships in surgical pathology, at Stanford in 2002, where she served as chief resident in 1998. Dr. Treynor is also a fellow of the College of American Pathologist. With an adventurous spirit, Dr. Treynor keeps active by traveling, surfing, podcasting, and tandem biking with her radiologist husband, among her many interests beyond the microscope.

Dr. Sandeep Krishnan

Dr. Sandeep

MD, FACC
Board Certified in Internal Medicine,
Interventional Cardiology, Cardiovascular Diseases
Associate Partner,
MD Senior Living

Dr. Sandeep Krishnan is board certified by the American Board of Internal Medicine in Internal Medicine, with subspecialty certifications in Interventional Cardiology and Cardiovascular Diseases. Dr. Krishnan was recently awarded the American College of Cardiology’s Excellence in Advocacy Award. He was also featured in the ACC’s Cardiology publications and website for his work in designing and operating a fully functional echocardiography clinic in the Himalayan Mountains of India. He is passionate about seniors and a substantial portion of his practice is devoted to working with the elderly and their cardiac care issues.

Dr. Priyanka

M.D.
Board Certified in Endocrinology
Associate Partner,
MD Senior Living

Dr. Priyanka is a board certified Endocrinologist and completed her Internal Medicine and Endocrinology training in Tampa, Florida. She currently serves as the Director of Osteoporosis services at a private practice clinic (SCKE.) Dr. Priyanka has a deep passion for the geriatric population, and will be managing our residents with diabetic and other endocrine issues. She strives to help her patients better understand their medical conditions and works with them toward improved health and well-being.

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