Our Team

Raj Thakur, MD - Chief Executive Officer

Dr. Raj Thakur has been with Advanced Diagnostics Healthcare System since the company’s inception. A diagnostic and interventional radiologist practicing in Houston, Texas for over 20 years, Dr. Thakur and his team specialize in minimally invasive image guided treatments. As Chief Executive Officer, Dr. Thakur’s vision is to streamline the delivery of patient care for physicians and healthcare workers in order to improve patient outcomes and their overall experience.

Rob Turner - Chief Development Officer

Rob Turner has contributed to the growth of Advanced Diagnostics Healthcare System for many years in a consulting role and officially joined the organization in 2016. He brings more than 25 years of executive healthcare leadership and management of medical laboratories, skilled nursing facilities, long term acute care hospitals and general acute care hospitals. Mr. Turner is continuously leading and driving those around him. His impressive market knowledge combined with an entrepreneurial spirit is invaluable to development. When he is not working, Mr. Turner attends various church activities and assists with rehoming lost animals with his wife’s pet rescue organization.

Joseph Lenahan - Chief Executive Officer, Cognizant Management Solutions

Joseph Lenahan joined Advanced Diagnostics Healthcare System in 2009. Mr. Lenahan brings a passion for operational excellence and delivery to the customer which is exemplified by the operations team and their commitment to delivering flawless service execution. A respected leader that drives this team to reach new successes each day, Mr. Lenahan brings more than 30 years of combined front-line leadership experience from service industry leaders including American Airlines and Waste Management. Outside of work, Mr. Lenahan and his wife work closely with local area rescue organizations fostering several homeless pets.

Mark Previty, CPA - Chief Financial Officer

Mark Previty, CPA joined Advanced Diagnostics Healthcare System in 2017, bringing more than 30 years of experience in financial management, planning & analysis, and systems implementations. He leads the finance unit for Advanced Diagnostics and is the chief financial spokesperson for the organization. Mr. Previty manages strategic and tactical matters as they relate to budget management, cost benefit analysis, forecasting, insurance and investor relations. In tandem with the COO, he provides both operational and programmatic support to the organization. His impressive achievements are demonstrated in his ability to establish cost saving systems and increased operation profits without sacrificing service. Outside of work Mr. Previty proudly serves as treasurer of his parish church, his homeowner’s association and a parolee halfway house. 

Kendall Brock - In-House Counsel

Kendall Brock serves as In-House Counsel for Advanced Diagnostics Healthcare System, its subsidiaries, and affiliates. Mr. Brock brings over 20 years of legal experience in private practice, regulatory functions and as sole In-House Counsel of a medical holding company. His legal experience includes mergers and acquisitions, real estate, strategic planning and compliance. He leads the legal department for Advanced Diagnostics Health System, and in coordination with the CEO and Chairman, provides both direct and supervisory legal support to the organization internally while coordinating the efforts of outside counsel.

Jesse Pedroza - Regional Facilities Director

Jesse Pedroza first served Advanced Diagnostics Healthcare System in 2016 as Facilities Director and he returned to the company in 2019 as Regional Facilities Director. An active member of the American Society for Health Care Engineering, Mr. Pedroza has over 15 years experience in the healthcare industry along with more than 20 years of HVAC experience. In addition to overseeing the Facility Directors at all Advanced Diagnostics locations, Mr. Pedroza is the Safety Officer for Advanced Diagnostics and chairs the company’s Environment of Care Committee. He also manages the dietary, engineering, environmental services, security, and valet departments at River Oaks Hospital & Clinics. When he is not working, Mr. Pedroza enjoys spending quality time with his wife and two young sons along with their dog.

Kevin Smoot - Executive Director, Subacute Trauma Program

Kevin Smoot joins Advanced Diagnostics Healthcare System with over 30 years of management and sales and marketing experience. Mr. Smoot has extensive experience in business development and managing business units. Outside of work Mr. Smoot has worked on the advisory board for the Texas Southern School of Business, Big Brother and Big Sisters, Prisoners Entrepreneur Program (PEP) and volunteers at Provision School in Houston.

Griselda Phillips - Director of Revenue Cycle Management

Griselda Phillips joins Advanced Diagnostics Healthcare System with over 20 years of experience in practice and revenue cycle management for acute care and behavior health hospitals as well as other ancillary services such as durable medical equipment, ambulance services and home health services. Ms. Phillips leads the revenue cycle team in a variety of functions including insurance verification, utilization review, charge audit reviews, billing, collections and denial management. Her significant insight is helping Advanced Diagnostics provide quality healthcare services while simultaneously helping reduce patient cost.

From left to right: Joe Lenahan, Chief Executive Officer, Cognizant Management Solutions; Rubin Shah, Chief Executive Officer, East Houston Hospital & Clinics; Christopher Douglas, Ed.D, Chief Executive Officer, River Oaks Hospital & Clinics; Raj Thakur, MD, Chief Executive Officer; Rob Turner, Chief Development Officer; Mark Previty, Chief Financial Officer