Recently, he held the position of senior vice president for research and development in Dr. Reddy’s Laboratories Ltd., the second largest generic company in India, located in Hyderabad. Bhattacharya joined the faculty of Texas A&M-Kingsville after many years in the pharmaceutical industry, where he started his career with Merck & Co., Inc. as a senior research chemist in process research and development. Later, Bhattacharya joined Hoechst, where he rose to the position of lead chemist in the Innovator Group. He then held the position of group leader in Central Process Research of Bristol Myers Squibb until joining the faculty of Texas A&M-Kingsville in 1999.