After his graduation from law school, he studied law with his brother-in-law New York Supreme Court Justice Martin J. Keogh (the husband of his sister Katherine Temple Emmet)[7] he was admitted to the bar, and practiced with Emmet & Robinson, the law office of his father.[6]
Emmet entered politics as a Republican. He was a member of the New York State Assembly, representing the second district (Westchester County), in 1897. In the Assembly, he was appointed to the Judiciary and Trades and Manufactures Committees by Speaker O'Grady, served briefly until his death in February 1897.[6]
Personal life
On June 6, 1894, he married Mary Lamport Olyphant, the only daughter of Mary (née Lamport) Olyphant and Harwood Vernon Olyphant.[8][9] Together, they were the parents of one child: Mary Olyphant Emmet (born 1895).[6]
He died of typhoid fever during the legislative session, at his lodgings in Albany, New York, on February 7, 1897.[10] After his death, his widow remarried to Harvard graduate and banker, Philip Curtis in 1899.[11]