Senior Leadership

Dave Halter, MBA

Senior Vice President, Strategic Finance Operations

Dave Halter headshotAs Senior Vice President of Strategic Finance Operations, Dave Halter leads the enterprise strategy group, which is responsible for prioritizing and managing corporate strategic capital investment dollars. In this capacity, Mr. Halter heads MedImpact revenue planning, optimization and management, and also partners with sales, marketing and operations to provide strategic business support.

Prior to joining MedImpact, Mr. Halter held leadership positions at Merck-Medco, where he built a new business unit to deliver improvements in consumer communications, achieve operating efficiencies, and drive the company toward a stronger consumer focus.

Mr. Halter holds a Bachelor of Arts in Economics from Boston College, where he graduated magna cum laude, and a Master of Business Administration from Columbia Business School.

Virginia Howe, PharmD

Senior Vice President, Health Services

Virginia Howe headshotVirginia Howe is a 12-year MedImpact veteran with PBM experience built on many roles and responsibilities within Health Services. As SVP of Health Services, Dr. Howe is responsible for the development and management of multiple quality clinical programs to improve healthcare and reduce the drug spend for MedImpact’s clients.  These programs are evidence-based with metrics focused on innovative strategies to improve health outcomes and optimize client’s return on investment.  The approaches include but are not limited to unique formulary designs, cost management tools, advanced analytics and expert clinical consultative services.

Before joining MedImpact, Dr. Howe worked more than 30 years as a clinical pharmacist in ambulatory, critical care and anticoagulation clinics at several major teaching hospitals including Stanford University Hospital, Santa Clara Valley Medical Center and San Francisco General Hospital.

Dr. Howe holds a Doctor of Pharmacy degree from the University of California San Francisco and an undergraduate degree from University of California at Berkeley.

Lisa A. Varrato

Senior Vice President, Account Management


Lisa Varrato headshotAs Senior Vice President, Account Management, Lisa Varrato oversees the overall satisfaction, retention and growth of our customers. Lisa has a wealth of knowledge and proven success on partnering with our clients to accomplish common goals. As a member of MedImpact’s Senior Leadership team, she helps the organization achieve improved client satisfaction by driving flexible solutions to optimize customer experience and assists customers in achieving their business and financial objectives through their partnership with MedImpact.

Lisa has more than 27 years of healthcare industry expertise in pharmacy benefit management, sales and account management, government programs and implementation. She joined MedImpact in 2006 as a Senior Account Executive in the managed care market segment. She was promoted to Regional Director in 2009 and named Vice President of Account Management in 2013. Lisa has been instrumental in leading our account teams to ensure overall client realization through organizational support while obtaining retention and growth objectives.

Prior to joining MedImpact, Lisa previously was the Director of Sales and Marketing at Advanced Imaging. As a Senior Account Executive at Caremark and AdvancePCS, she was responsible for managed care and hospital organizations. Lisa also worked as an Account Executive for Advance Paradigm and Scrip Card/HCPP in the early 1990s.

Nancy S. Radtke, Esq.

Senior Vice President, Corporate Services and General Counsel

Nancy Radtke headshotAs senior corporate counsel, Nancy Radtke is responsible for all aspects of MedImpact's corporate governance, legal operations and regulatory compliance. She is an expert in corporate and healthcare law, including litigation, contracting, risk analysis, and federal and state PBM regulations. Ms. Radtke also is engaged in creating client-specific solutions to complex legal and regulatory mandates. She is a credentialed mediator with extensive experience in dispute resolution.

As state and federal regulatory policies have changed, Ms. Radtke has helped MedImpact maintain the highest levels of compliance, and has helped the company's clients navigate the new rules and mandates.

Ms. Radtke has been a member of the State Bar of California since 1991, has a law degree from National University (now Thomas Jefferson) School of Law, a Bachelor of Science from Northern Arizona University, and a Master's degree from the University of California, Santa Barbara.

Paul Chan

Senior Vice President, Operations

Vasu Bobba headshotAs Senior Vice President, Operations, Paul Chan has responsibility for Business Solutions, Configuration Services, Adjudication Services, Contact Center Services, Account Team Operational Staff, and Client Implementations, and for the delivery of core PBM services to our customers and members. He is a results-oriented executive with 20 years of experience delivering complex business solutions through process engineering. Mr. Chan was co-awarded a patent in 2010 for developing dynamic claims adjudication capabilities at the point of sale.

Mr. Chan has 13 years of healthcare experience, having joined MedImpact in 2006, and has led numerous complex client integrations providing him experience to all facets of PBM systems, services, and lines of business. Prior to MedImpact, he worked in the finance sector (credit services) for nine years managing technical teams. Mr. Chan studied Computer Science Engineering at the University of California, San Diego.

Vasu Bobba

Chief Technology Officer

Vasu Bobba headshotAs the Chief Technology Officer, Vasu Bobba is responsible for developing the technology strategy and, in close collaboration with the Chief Information Officer, providing technical leadership to enhance MedImpact's product offerings.

Vasu joined MedImpact in 2002 and has more than 25 years of IT experience. He has deep knowledge of MedImpact's systems and technologies as well as a good understanding of client and market needs. He has led a large software engineering function throughout his years at MedImpact and has helped shape the current IT organization.

Prior to joining MedImpact, Mr. Bobba held a number of positions providing technical solutions to the automotive industry. He has a Master’s degree in Mechanical Engineering from the University of Oklahoma where he specialized in improving CAD software.

Asokan Selvaraj

Chief Information Officer

Vasu Bobba headshotAs the Chief Information Officer, Asokan Selvaraj is responsible for delivering quality technology products for MedImpact’s PBM clients and for the evolution of MedImpact’s PBM platform. He collaborates closely with the Chief Technology Officer and provides oversight to the IT Security, Application Support and Infrastructure, Data Warehousing, and IT Services departments. Asokan joined MedImpact in 2006 and has played several roles in shaping MedImpact’s technology landscape.

Asokan has more than 25 years of professional experience in technology ranging from hands-on software development to information systems architecture. Prior to MedImpact, Asokan has served as a technology consultant for several large corporations including MCI, CSC, Liberty Mutual, and First American.

Asokan holds a Master’s in Electrical Engineering from the University of Texas at Austin, and a Bachelor’s in Electronics and Communications Engineering from the College of Engineering, Guindy, India.