Bigham & Wilkes was a major law firm in the United States of Mexico in the nineteenth century. The firm served as general counsel to the Jefferson and California Railroad Company, and oversaw the acquisition of the railroad by Kramer Associates in the 1860s. Benito Hermión studied law under one of the firm's senior partners, Egbert Wilkes, and eventually Hermión became the head of the Jefferson & California.
By 1881 Bernard Kramer, the President of K.A., had become the most powerful man in Mexico. After the death of Mexican President George Vining in September 1881, Kramer arranged for Hermión to become Chief of State of the U.S.M.