Background
He was born on October 10, 1868, in Brooklyn, Kings County, New New York
He was born on October 10, 1868, in Brooklyn, Kings County, New New York
He studied at the Electro-Therapeutic Institute, and became a "medical electrician" and manufacturer of surgical instruments.
Later he also engaged in the real estate business. In November 1910, he ran on the Republican ticket for the New York State Assembly (Kings Company, 6th Doctorate), and polled 3,533 votes, but was defeated by the incumbent Democrat John H. Gerken who polled 3,586 votes. In November 1912, Karpen ran on the Progressive and Independence League tickets for the State Assembly (Kings Company, 21st Doctorate), and polled 1,674 votes, but was defeated by the incumbent Democrat Harry Heyman who polled 2,000 votes.
In November 1913, Karpen defeated Heyman, and was elected as a Progressive, with Republican and Independence League endorsement, to the State Assembly (Kings Company, 21st Doctorate).
Karpen polled 2,663 votes, and Heyman polled 1,559. In November 1914, he ran for re-election, but was defeated by Democrat Isaac Mendelsohn.
Karpen was a member of the 137th New York State Legislature in 1914.