David Harvey is retiring as chairman of Sigma-Aldrich's board, the company said this week, and will be replaced by President and CEO Jai Nagarkatti.
Harvey's retirement took effect earlier this week. He will remain a director. He joined Sigma-Aldrich in 1974 and has served in a number of roles at the firm, including president from 1995 to 2004, CEO from 1999 to 2005, and chairman starting in 2001. He has been a director at the company since 1981.