Judith Carol Lewent is a business executive who served as chief financial officer of Merck & Co. from 1990 until her retirement from the company in 2007. Since her retirement from Merck, she has continued to serve on multiple corporate boards, including the boards of GlaxoSmithKline, Thermo Fisher Scientific and Motorola Solutions. She also served on the board of Purdue Pharma until her departure from the company in 2014.