Who is this person?

[L Verge]

that's Fido's playmate, Thomas (Tad) Lincoln

I found that photo new to me. It was taken while Tad was a student at a school in Germany. I'll have to supply the name of the school tomorrow when I get back to work where the book is. I'll bet some of you already know the name of the school, however.

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I don't know who it is, but I once tried to dig up a photo of Dr. Hohagen, and this gentleman looks like what I would have expected to find. (Since the Stadtarchiv Frankfurt had no photo, I doubt it's Dr. Hohagen.)
So I guess Alexander Williamson?

I truthfully did not think anyone would know this man, but you continue to amaze me! If I had not posted it right after the Tad photo, would you have known it was Tad's tutor?