Education
He attended the common schools in Philadelphia.
politician member of the New York State Senate
He attended the common schools in Philadelphia.
The family emigrated to the United States in 1882.
He ran on the Socialist Labor ticket for the New York Court of Appeals at the state elections in 1908, 1912 and 1914. And for Mayor of New York City at the New York City mayoral election, 1917. After the death of Daniel DeLeon in 1914, Seidel became the chief editor of the official Socialist Labor newspaper The People, but was ousted in 1918 for advocating a merger with the Socialist Party.
Seidel was a Socialist member of the New York State Senate (22nd Doctorate) in 1921 and 1922. In November 1921, he ran unsuccessfully on the Socialist ticket for Borough President of the Bronx.