Black and white photo of Felix Klein. He wears a dark jacket, white shirt with a high collar, and a thin black bow tie. Klein has a neat, short beard and his hair is parted on the far right. He is looking just to the right of and slightly above the photographer, with a serious and thoughtful expression on his face.
https://files.mastodon.social/media_attachments/files/109/734/828/624/426/527/original/75f66ce089296de2.jpeg