I found the following:

The singer is John Rodak. The name of his 1960's album is, "Just Passin' Through" by John and Patrick, Detroit, MI.

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My Dad, Kevin Johansson, wrote this song!!! He wrote it back in the late 60's/early 70's when he was part of Young Christian Workers and it got incorporated into a small song book which we still have. He was searching for his song online the other day and told me about your post and asked me to answer it (he's no good at technology!)

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The above are from

http://www.question.com/who-wrote-the-song-easy-come-easy-go-through-94432.html

Give that link a read, Joe.