Upon his return to the Gold Coast, he began private legal practice in Accra at Kojo Thompson's chambers. In 1929, Bossman was a founding member of the Gold Coast Youth Conference and served as the first secretary of the group. He was a member of the
Coussey Committee on constitutional reform from 1948 to 1949. He once served as a general secretary of the Gold Coast Bar Association and in July 1955, he represented the association at the Commonwealth and Empire Law Conference in
London. and in 1962 he became a Supreme Court Judge. In January 1964, the then president
Kwame Nkrumah held a referendum that gave him power to dismiss Supreme Court Judges and High Court Judges. On 2 March 1964, Bossman together with
Edward Akufo-Addo and
Robert Samuel Blay were dismissed and their appointments revoked by the then president Kwame Nkrumah. In 1966, Bossman was appointed member of the constitutional commission. He died in 1967 while still a member of the commission. He was later a member and general secretary of the National Democratic Party. He contested for a seat in Accra in the 1951 elections but lost. The party was later merged with the
United Gold Coast Convention to form the Congress Party in 1952. == Personal life ==