WilliamKeleher.com: Six Generations in America06/28/2016 Tagged With: Keleher, Keleher & McLeod, KeleherKeleher, Michael Keleher, William KeleherWilliam A. Keleher (1886-1972) founded the Oldest and Largest Law Firm in New Mexico, Keleher & McLeod, P.A. The William Keleher site WilliamKeleher.com .