Lemke, with over 20 years of experience in critical financial reporting and management positions, succeeds Anthony Chilton, who has resigned as CEO to pursue other opportunities.
Bioanalytical Systems chairman John Landis said Lemke has demonstrated exceptional skill, energy and commitment since she joined BASi as CFO three months ago.
"In this short time she has significantly reduced the company’s cost structure, refocused our marketing program, and instituted aggressive performance goals for all operating departments," Landis added.
"Board member Richard Johnson and I, with more than 60 years of combined major pharma and CRO experience, will work closely with Jackie during this interim period."
Lemke was most recently the vice president of Finance and global CFO of Remy, a $900m division of Remy International, where she created a 44-person global finance team and built a financial system.
Prior to this, she served as vice president of Finance, Global CFO Connected Home Solutions at Motorola, and was strategic planning director, Global Invista division at DuPont.