Daniel Van Winkle, History of the Municipalities of Hudson County… (1924)
“ McMahon is a Democrat, and when he entered public office it was in the capacity, for which his training gave him ample qualifications, of assistant district attorney. He has a large practice, and has won a reputation that is based upon proved ability and professional training equal to the heavy demands that have been made upon it. Mr. McMahon fraternizes with Jersey City Lodge, No. ”
