John Martin went with his brothers during the California Gold Rush and mined successfully for one year.[2] In 1855, in the Minnesota Territorial town of St. Anthony, John Martin was standard-bearer and leader on horseback of the ceremonial opening of the Hennepin Avenue Bridge, the first major permanent bridge across the Mississippi River.[3]
He became President of the First National Bank, he owned the largest lumber mill in the area until it burned in 1887,[4] and he was founding officer of Minneapolis and St. Louis Railway and Minneapolis, St. Paul and Sault Ste. Marie Railroad.[5][6] In 1903, with his financial support to Children's Home Society of Minnesota, the Jean Martin Brown Receiving Home was built to provide a place where children could stay until they were adopted.[7]
John Martin was married in 1849 to Jane B. Gilfillan[8][9] sister of Minnesota Representative John Bachop Gilfillan, also from Peacham, Vermont. They had one surviving child, Jean Martin Brown (1850-1901). Her son, and sole direct descendant, was Earle Brown,[10] noted Hennepin County Sheriff (1920), founder of the Minnesota State Patrol (1929), and Republican gubernatorial candidate for Minnesota (1932).[11]
John Martin died at his home in Hennepin County on May 25, 1905.[9] He and his family members are buried at Lakewood Cemetery in Minneapolis.