Dr. Tannenbaum holds an M.D. from Vanderbilt University School of Medicine and a Ph.D. in Pharmacology from Vanderbilt University School of Graduate Studies. He completed his training in Internal Medicine at the Jewish Hospital of St. Louis and his Nephrology training at Barnes Hospital, both affiliates of Washington University of St. Louis School of Medicine.

He is Board Certified in Internal Medicine and Nephrology and is a Fellow of the American College of Physicians (FACP).

He was the founder of REN Corporation-USA where he served as the President, Chairman and Chief Executive Officer from 1987 through 1993.

During his tenure at REN he led the company from a start-up venture to a position as the fourth largest dialysis provider in the United States with revenues exceeding $100,000,000 per year. During that time the company was taken through an IPO and sold to a strategic acquirer (Gambro AB) for an implied value of $400,000,000.

In 1993 he founded Medical Information Management Systems, Inc., a medical software company (MIMS). MIMS was a pioneer in the development of electronic medical records and was the first company to have an Internet accessible comprehensive medical record solution. MIMS received funding from a number of sources including Bristol-Myers-Squibb. It was ultimately sold to National Nephrology Associates.

In 1998 Dr. Tannenbaum became Chairman and Chief Executive Officer of National Nephrology Associates, Inc., a company he co-founded with some of his original management team from REN. Following an investment from J.W. Childs and Indosuez Capital, Dr. Tannenbaum led NNA from a start-up venture to become the fifth largest dialysis provider in the United States with 85 clinics operating in 14 states and annual revenues that exceeded $250,000,000.

In March 2004, Renal Care Group, a New York Stock Exchange Company, purchased NNA for $345,000,000. Dr. Tannenbaum left NNA in June 2003 to co-found DSI with Dr. G. Patrick Maxwell and certain members of the NNA, MIMS, and REN former management teams.

He completed a fellowship in microsurgery at the University of California, San Francisco, and a fellowship in hand surgery at the Curtis Hand Center in Baltimore, Maryland. He is a member of the clinical faculty at the Department of Plastic Surgery at Vanderbilt. In 1993, Dr. Maxwell served as nationwide visiting professor for the Plastic Surgery Education Foundation.

At IMRAC, she oversaw operations, human resources, sales, marketing, customer service, contract billing services, HIPAA compliance and program development. While there, she was responsible for information technology functions used by all the facilities owned or operated by National Nephrology Associates.

These systems include a fully integrated electronic medical record, a physician order entry system, centralized perpetual inventory control, centralized risk management, laboratory systems for each facility, centralized asset tracking, automated drug dispensing, centralized automated purchasing, centralized payable processing, centralized payroll processing and employee benefits management, centralized billing and collections, multi-facility and multi-department general ledger, clinical quality assurance and automated staff assignment scheduling.

National Nephrology’s home office systems managed the procurement and delivery of approximately 25,000,000 supply items per year for almost 1,000,000 outpatient dialysis visits and 40,000 in hospital, critical care unit dialysis treatments per year.

In addition, these systems managed the collection and government reporting of the quality assurance and medical data on each of these treatments, the procurement and administration of over 4 million intravenous drug infusions per year, and the procurement and reporting, including critical value alerting, of over 7,000,000 laboratory studies per year. The registration, discharge, and transfer activities involving these patients, and interaction with the representatives of various managed care entities who contracted for services with NNA, nationwide, were under the general direction of Mrs. Lefkovitz.