 Mruk served from January 1, 1950 to December 31, 1953, and his time in office was highlighted by his concentration on rebuilding the city's infrastructure, including streets, bridges and viaducts.He also worked to improve parks and recreation areas, instituted a lighted school house program to foster community involvement in the city's education system, and hired the city's first school crossing guards.Relying on his business experience to master the details of Buffalo's budgets and spending, Mruk took pride in effecting most of his programs without having to increase local taxes.