Clayberg, John Bertrand was born on October 8, 1853 in Cuba, Illinois, United States. Son of George and Elizabeth (Baughman) Clayberg.
Educated Cuba, Illinois. Bachelor of Laws, University of Michigan, 1875.
Admitted to bar, 1875. Employed by Judge Thomas M. Cooley in works on Taxation and Torts, 1874-1876. Moved to Montana, 1884, attorney general Montana, 1889.
Non-resident lecturer on mining law and irrigation, University of Michigan, mining law, Columbia, also School of Mines, Montana. Chief commissioner of the Supreme Court of the Montana, 1903-1905. Honorary dean Law Department, University of Montana, and professor mining law.