Career
He formed Cochrane and Garnsey with George O. Garnsey. He began work in Davenport, Iowa in 1856, moving to Saint Louis in 1858 after the Panic of 1857. With the onset of the Civil War, we returned to his boyhood home in New Hampshire.
In 1864, he moved to Chicago and began working as an architect, with his design being selected for the Illinois State Capitol in 1868.
He designed numerous buildings, including:
Iowa State Capitol, Grand Avenue. and East. 12th Saint, Des Moines, Iowa (Cochrane,J), listed on the National Register of Historic Places (NRHP)
Illinois State Capitol, Capitol Avenue and Second Street, Springfield, Illinois NRHP-listed
Cook County Hospital, 1835 West Harrison Saint, Chicago, Illinois NRHP-listed
Lambrite-Iles-Petersen House, 510 West. 6th Saint, Davenport, Iowa, one of the earliest examples of Italianate architecture in the state of Iowa and a contributing property in the Hamburg Historic District. Livingston County Courthouse, 112 West. Madison, Pontiac, Illinois (Cochrane,JC) NRHP-listed
Marshall County Courthouse, Courthouse Square, Marshalltown, Iowa (Cochrane,JC) NRHP-listed
Ivory Quinby House, 605 North. 6th Saint, Monmouth, Illinois (Cochrane,JC) NRHP-listed
One or more buildings in Marshalltown Downtown Historic District, Roughly bounded by 2nd Saint, State Saint, 3rd.
Avenue., and East. Church Saint, Marshalltown, Iowa (Cochrane, John C) NRHP-listed
One or more buildings in Saint Katherine"s Historic District, 901 Tremont Saint, Davenport, Iowa (Cochrane,John C) NRHP-listed
The former Scott County Courthouse, Davenport, Iowa, completed by architect John West. Ross after Cochrane"s death.
