Rudolph Kayser

A first edition literary portrait of Albert Einstein, signed by Einstein.

• Anton Reiser [pseudonym of Rudolph Kayser] (German).
• Albert Einstein: A Biographical Portrait.
• New York: Albert & Charles Boni, 1930.
• Octavo.
• 225 pages.
• Includes plates.
• Signed by Einstein on the endpaper.
• Bound in the publisher's red and grey cloth lettered in black.

"Anton Reiser" is a pseudonym for Einstein's son-in-law, Rudolph Kayser. In Einstein's one-page preface, he writes that "The author of this book is someone who knows me rather intimately in my endeavor, thoughts, beliefs—in bedroom slippers..." The biography is noted as Louis Zukofsky's first book (i.e., translated anonymously by Zukofsky). An elusive title, the work is rarely encountered signed by Einstein.