Leadership Team

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House MD Leadership Team

Daniel R. Raio


Daniel R. Raio is a founding partner of OnSite Medical Solutions.  Daniel is the creator of NOTCH Management Group and his healthcare brand HOUSE MD.  In December of 2020, his organization merged with OnSite Medical Solutions to form one company and medical practice.

On a mission to improve access to quality healthcare, he is focused on improving the patient experience and creating an innovative and streamlined collaborative healthcare practice for both patients and providers alike.

Prior to conceptually creating and developing House MD, Daniel gained his experience in medicine as a provider with Island Cardiac Specialists, an NYU Winthrop affiliate. Daniel specializes in non invasive cardiology, he spent over 10 years with Island Cardiac where he created and developed their chronic disease management and congestive heart failure clinics alongside his brother Dr Nicolas Raio.

A graduate from SUNY at Albany with degrees in psychology and business, Daniel went on to become an account executive, marketing director, and branding expert where he refined his business acumen. After his father Dr. Frank F. Raio, who was a well-known and respected internal medicine physician, became gravely ill, Daniel decided that he wanted to join his father's inspiring legacy and went on to earn his degree in medicine as a PA. He completed his medical training at Touro College.

Daniel serves as President of OnSite Medical Solutions and is a managing partner and Co-Chairman of the board with Dr Andy Sama. He develops, implements, and enforces policies and procedures of the organization by way of systems that improve overall operation and effectiveness. He works hard to establish stability throughout the organization as an effective developer of solutions to business challenges. Daniel evaluates the finance division structure and team plan for continued improvement of the group, as well as providing individuals with professional and personal growth.

Andrew Sama, MD FACEP


Dr. Sama is a founding partner of OnSite Medical Solutions and serves as the Chief Executive Officer of Progressive Emergency Physicians. Before becoming the CEO of Progressive, Dr. Sama was primarily affiliated with the North Shore-Long Island Jewish Health System. He initiated the Department of Emergency Medicine at North Shore University Hospital and assisted in creating the North Shore-Long Island Jewish Emergency Medicine Service Line in which Dr. Sama led over 300 physicians, fellows, and residents throughout 16 locations.

During his tenure with the North Shore-Long Island Jewish Health System, Dr. Sama was the Chairman of the Executive Committee of the Medical Group.

Dr. Sama has been a member of the American College of Emergency Physicians (ACEP) for more than 25 years. In October 2007, he was elected to the Board of Directors of National ACEP, re-elected in 2010. He served as the Secretary-Treasurer of ACEP from 2009-2010; Vice President from 2010-2011; President-elect from 2011-2012; President from 2012-2013 and Chairman of the Board from 2013-2014.

Christopher C. Raio, MD MBA FACEP FAIUM


Dr. Raio is a founding partner of OnSite Medical Solutions and is a board-certified Emergency physician currently serving as Chief of Emergency Medicine for Catholic Health Services of Long Island and Chairperson of Emergency Medicine at Good Samaritan Hospital Medical Center.

Dr. Raio completed his Bachelor of Arts in Political Science with honors at the University of Florida and graduated from the Howard University College of Medicine in 2000. In 2003, he finished his Emergency Medicine residency training as chief resident at North Shore University Hospital and pursued emergency ultrasound fellowship training the following year.

In 2012, Dr. Raio received his MBA in Health Services Management with Distinction from Hofstra University. Before joining Progressive Emergency Physicians, where he is Chief Medical Officer, Dr. Raio served as Vice Chairman of Emergency Medicine at the North Shore University Hospital in Manhasset, New York. He has extensive experience in Emergency Department operations and Observation Medicine.

Additionally, Dr. Raio is well-published, lectures nationally and internationally, and has held several academic appointments, including Associate Professor of Emergency Medicine at The Hofstra North Shore-LIJ School of Medicine. He previously served on the Board of Directors for the New York Chapter of the American College of Emergency Physicians.

Dr. Raio has been intimately involved in leading several Emergency Departments through the COVID-19 pandemic.

Stefan M. Muehlbauer, MD PhD FACEP


Dr. Muehlbauer is a founding partner of OnSite Medical Solutions. He is a board-certified Emergency physician currently serving as Chairman of Emergency Medicine at St. Francis Hospital and was previously the Director of Emergency Department Infection Oversight at St. Francis.

Having served as an Assistant Professor of Emergency Medicine at North Shore University Hospital, Dr. Muehlbauer has extensive and wide-ranging medical experience. At North Shore University Hospital, he was appointed to the core academic faculty, serving as the Emergency Medicine Clerkship Director and Emergency Department Sepsis Champion. Additionally, he was appointed to the academic faculty at Harvard Medical School, where he was an attending physician at Harvard affiliate hospitals, primarily Beth Israel Deaconess Medical Center. Dr. Muehlbauer also held an appointment as a Basic Science Investigator at the Center for Vascular Biology Research at Harvard Medical School.

Dr. Muehlbauer received his medical degree at the Albert Einstein College of Medicine, where he was a fellow of the Medical Scientist Training Program and earned a Ph.D. in Microbiology and Immunology, with a focus on infectious agents and virology. His doctoral research focused on the mechanism and role of cell death in septic shock and systemic inflammation, with a focus on anthrax toxin, virology, and emerging pathogens. He completed his residency in Emergency Medicine at the Harvard Affiliated Beth Israel Deaconess Medical Center, where he was recognized with the clinical excellence award, the highest honor granted to a graduate of the program.

His publications have appeared in PLOS, The American Journal of Pathology, The Journal of Biological Chemistry, Cell Cycle, and Biochemical and Biophysical Research Communications. Dr. Muehlbauer has lectured nationally and internationally and is the author of the ‘Bugs and Drugs’ lecture series for Emergency Medicine residents and providers.

Currently, Dr. Muehlbauer is a co-principal investigator in a randomized clinical trial on novel therapeutics for the outpatient treatment of COVID-19. He has co-authored a study in Clinical Cardiology, “Reduced cardiac function is associated with cardiac injury and mortality risk in hospitalized COVID-19 Patients”. Dr. Muehlbauer directed the Emergency Department response to COVID-19 at St. Francis Hospital and has worked closely with regional leadership in an advisory capacity.

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