Here's an interesting portrait. This individual was most definitely a Yekke who lived in the 18th and 19th centuries. I'll say who he is a little later (either in the comments or by updating the post), but right now that would detract from the visual impact.
Edit: I updated the post; now the original image with its caption is posted. As noted in the comments, this is Aron Wolfsohn, who was also known as Aharon ben Wolf Halle and eventually as Aharon Wolfsohn. He was co-editor of Hameassef with Joel Brill, and later rabbi of Hildesheim.
