Mark Hopkins Jr.

Mark Hopkins Jr. (September 3, 1813 – March 29, 1878) was an American railroad executive. He was one of four principal investors that funded Theodore D. Judah's idea of building a railway over the Sierra Nevada from Sacramento, California, to Promontory, Utah. They formed the Central Pacific Railroad along with Leland Stanford, Charles Crocker, and Collis Huntington in 1861.