You don't often, if ever, see images of Mr. Baker. Found this shot in an article from 2015 about his work with the Fellowship of Christian Athletes. Here's the link to the article:
Fellowship of Christian Athletes and Jack Baker hit home runs with young lives in Alabama Bright Lights - Alabama NewsCenter
From the photo, it's clear it was taken 9/23/76 in Boston as Baker crossed home plate after hitting his first and only major league home run, off Billy Travers of the Brewers. The next hitter, Butch Hobson, is congratulating him.