Cockrum, John Barrett was born on September 12, 1857 in Oakland City, Indiana, United States. Son of William M. and Lucretia Cockrum.
Educational public schools, Oakland City. Bachelor of Laws, Cincinnati Law College, 1879.
Admitted to Indiana bar, 1879. Assistant United States district attorney for Indiana, at Indianapolis, 1889-1893. Assistant general attorney L.E.&W. and Fort Wayne, Cincinnati & Louisville rys., 1893-1895, later general attorney.
Then general solicitor New York,C.&St. Louis R.R. (L.E.&W. district). Republican.