Jack Esselen
President and Chief Operating Officer

Prior to joining CallMD, Jack played a central role in developing three different early stage healthcare and technology companies into successful long term enterprises.  He was the Chairman and Founder of Medifile, Inc., a leading provider of personal health information services, which was merged with CallMD in 2007 to provide the foundation for FileMD,  CallMD’s Electronic Medical Record (EMR) platform. During his career, Jack has managed various product lines, service operations and sales organizations. He is experienced in all aspects of management, including sales, marketing, finance, software development, and service.




Dr. Vinson Michael Di Santo 
CallMD Medical Program Director

Dr. Vinson Michael Di Santo is a native of Philadelphia, Pennsylvania and received his medical education at the Philadelphia College of Osteopathic Medicine. He completed his internship at Phoenix General Hospital, in Arizona and post-graduate training at the University of California, San Francisco School of Medicine.

He is Board Certified in Family Practice and Clinical Nutrition, has a Ph.D. in Oriental Medicine, and he retains Acupuncture certifications in the U.S., U.K., and Canada. Dr. Di Santo is a Doctor of Homeopathic Medicine and is a certified Bau Biology Environmental Inspector.

Over the last twenty-plus years, Dr. Di Santo has practiced, promoted and taught Integrative Medicine, along with his work in Emergency, Occupational, Environmental and Urgent Care Medicine. To further expand his medical proficiency, he has served as Medical Director, Clinical ?irector and Chief Medical Officer for the Federal Bureau of Prisons where he successfully instituting infectious disease screening and monitoring systems which greatly outperformed the public sector. He was also involved cutting edge work in the areas of sick building syndrome, chemical sensitivity and immunotoxicology. His extensive experience and study has earned him professional membership in numerous organizations.

  Danny Pido
Chief Operating Officer/General Manager

Mr. Pido was previously a General Manager /COO of a global open electronic online B2B catering exchange. He has spent more than 25 years in the cabin and in flight services of Philippine Airlines (PAL), including serving as a GM/COO of a PAL flight kitchen in Dhahran, Saudi Arabia. Aside from being a senior executive consultant for a food and beverage consultancy group, Danny has spent several years as President/CEO starting and developing multiple companies, primarily in the catering industry.






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