He spent pretty much his entire New York Mets tenure ( 1967 - 1978 ) in the right - hander 's shadow .
Jerry Koosman debuted in the big leagues one day after Tom Seaver .
Jerry Koosman spent pretty much Jerry Koosman 's entire New York Mets tenure ( 1967 - 1978 ) in the right - hander 's shadow .
Jerry Koosman debuted in the big leagues one day after Tom Seaver .