Peter Wilver, Stephen Williamson

Thermo Fisher Scientific said that CFO Peter Wilver will retire, effective March 31, 2016. The firm's board of directors has named Stephen Williamson, currently VP of financial operations, to become the new CFO, effective Aug. 1, 2015. Wilver joined the firm in 2004 as CFO, and during his tenure the company's market cap grew from $5 billion to around $50 billion today, President and CEO Marc Casper noted in a statement.

Williamson joined Thermo Fisher in 2001 as VP of European financial operations, based in the UK, and subsequently served as the finance lead for the Informatics and Services, and the Environmental Instruments businesses. He was named VP of finance for Analytical Technologies in 2006, and two years later became VP of financial operations for the company.