After his graduation from law school, he was admitted to the bar and practiced law with the firm, Flanagan, Bright & Martine, which dissolved not long thereafter, at which point he practiced on his own for several years before partnering with Charles A. Jackson under the name Jackson & Martine (with offices in the
Morse Building). In November 1884, Martine was elected on the County Democracy ticket
New York County District Attorney. On taking office, he appointed
John R. Fellows and
De Lancey Nicoll as Assistant D.A.s, and
Vernon M. Davis as Deputy Assistant District Attorneys. Martine prosecuted
Jacob Sharp and several Aldermen for
bribery in connection with the concession for the
Broadway Surface Railroad. In April 1886, he ordered to be arrested all the Ex-Aldermen who had in 1884 voted for the railroad concession, seven of whom were eventually convicted. In November 1887, he was elected on the Tammany, County Democracy, Republican and Irving Hall (another faction of Anti-Tammany Democrats) tickets a judge of the Court of General Sessions, and remained in office until his death. ==Personal life==