Jon Wellner

Jon Wellner (born July 11, 1975) is an American actor best known for his role as toxicologist Henry Andrews on CSI: Crime Scene Investigation. He joined the show in season 4 as a researcher, ensuring accuracy in the information presented. Wellner portrayed a zookeeper in season 5 before taking on the role of Andrews, which he played from 2004 to 2015. Alongside his acting career, he continues to work as a researcher for the show. In 2009, he co-founded a company with fellow cast member David Berman, providing research for various television forensics shows, including Bones, CSI: Miami, and Drop Dead Diva.