Awesome! Thanks Jeff. I've never seen that photo - by all accounts I've read, Lumpkin was quite a character and playing without socks was one of his.... "quirks" - this picture confirms it. (And he wasn't bald as some sources have said - just helmetless
)
And that looks like coach Potsy Clark he's with - here are a few pages from an instructional football guide Potsy wrote in the 30s (lots of these are available on eBay inexpensively - I liked looking at the single wing plays)
Looks like coaching aged Potsy some - any idea what year that photo is from? My guess would be Father Lumpkin is wearing a Portsmouth Spartans jersey, but the colors look dark - even in b/w, I wouldn't think the yellow/gold on purple would look that way.