Senator Lacson was born in Iloilo, Iloilo on July 28, 1889 to Aniceto Lacson and Rosario Araneta.
He studied at the Ateneo de Manila and the San Juan de Letran College where he graduated in 1910 with the degree of Bachelor of Arts.
He was elected representative to the Philippine Legislature from Occidental Negros from 1925 to 1928 then provincial governor of the same province from 1928 to 1931. He became a Senator from the senatorial district comprising the provinces of Negros Occidental, Negros Oriental, Antique and Palawan from 1934 to 1935.
As a lawmaker, he served as chairman of the committees on banks and corporations and franchises, member of the committees on agriculture and commerce public works, communications, finance, railroads, justice, navigation, metropolitan relations and Commission on Appointments.