Dr. Varun Garg PhD, is Senior Director, Clinical Pharmacology at Vertex Pharmaceuticals, Inc., Cambridge, USA. Previously he held positions at Wyeth, Otsuka America, and Aronex. At Vertex, he has been involved with the development of antiviral drugs – HIV (fosamprenavir) and HCV. For the last several years, he has been involved in the development of telaprevir as the lead clinical pharmacologist for Vertex. Dr Garg has published/presented 40 papers and written 2 book chapters. He is a member of the Faculty of 1000 for the Antimicrobial Agents section of Pharmacology and Drug Discovery. Dr. Garg received his Ph.D. at the University at Buffalo under the supervision of Dr. William Jusko. His paper titled “Comparison of four basic models on indirect pharmacodynamic responses” published in the Journal of Pharmacokinetics and Pharmacodynamics in 1993 is one of the most widely cited papers on PK/PD modeling.