Koch was born in Crotona Park East section of The Bronx borough of New York City, the son of Yetta (or Joyce, nee Silpe) and Louis (Leib) Koch, immigrants from Kozliv and Uscieczko in Eastern Galicia. He came from a family of Conservative Jews who resided in Newark, New Jersey, where his father worked at a theater. As a child, he worked as a hatcheck boy in a Newark dance hall. He graduated from South Side High School in Newark in 1941.

Koch was the Democratic U.S. Representative from New York's 17th congressional district from January 3, 1969, until January 3, 1973, when, after a redistricting, he represented New York's 18th congressional district until December 31, 1977, when he resigned to become Mayor of New York City. Koch said he began his political career as "just a plain liberal", with positions including opposing the Vietnam War and marching in the South for civil rights. In April 1973, Koch coined the term "Watergate Seven" when, in response to U.S. Senator Lowell P. Weicker, Jr.'s indicating that one of the men in Watergate scandal had been ordered in the spring of 1972 to keep certain senators and representatives under surveillance, posted a sign on the door of his office saying, 'These premises were surveilled by the Watergate Seven. Watch yourself'. At about this same time, Koch began his rightward shift towards being a "liberal with sanity" after reviewing the 1973 controversy around then-New York City Mayor John Lindsay's attempt to place a 3,000-person housing project in the middle of a middle-class community in Forest Hills, Queens. Congressman Koch met with residents of the community, most of whom were against the proposal. He was convinced by their arguments, and spoke out against the plan, shocking some of his liberal allies. Koch was active in advocating for a greater U.S. role in advancing human rights, within the context of fighting a perceived threat of communism. He had particular influence in the foreign aid budget, as he sat on the House Appropriations Subcommittee on Foreign Operations. In 1976, Koch proposed that the U.S. cut off military aid and supplies to the government of Uruguay which was under a dictatorship. In mid-July 1976, the CIA learned that two high-level Uruguayan intelligence officers had discussed a possible assassination attempt on Koch by Direccion de Inteligencia Nacional (DINA), the Chilean secret police. The CIA did not regard these threats as credible until after the September 1976 assassination of Orlando Letelier in Washington, D.C., by Direccion de Inteligencia Nacional (DINA) agents coordinated by Operation Condor. After this assassination, Director of Central Intelligence George H.W. Bush informed Koch by phone of the threat. Koch subsequently asked both the CIA and the FBI for protection, but none was extended.

What other roles did Koch have?
Mayor of New York City.