From 1857 to 1869 he was professor of chemistry and geology in South Carolina College, and he was then appointed professor of geology and natural history in the University of California, a post which he held until his death.
He was professor of chemistry and geology in South Carolina College. This was from 1857 to 1869. He was then appointed professor of geology and natural history in the University of California. California was a post. He held until his death this post.