I believe Paul Kantner was one of the authors of Wooden Ships, along with David Crosby and Steve Stills. I always enjoyed hearing the JA take on the song since I heard the CSN version all the time.
wiki says, “You are correct!”
Kantner is indeed a co-author along with Crosby and Sills.
Both bands performed Wooden Ships at Woodstock, and released it on albums that year (’69)