Ezra S. Carr

Ezra Slocum Carr (March 9, 1819 – November 27, 1894) was a professor at the University of Wisconsin (where he was also briefly a member of the Board of Regents) and at the University of California - Berkeley. He was originally trained as a medical doctor but taught in several scientific fields. He was a one time California Superintendent of Public Instruction. Carr and his wife Jeanne were close friends of John Muir and were extremely influential in Muir's life at several key junctures.