WASHINGTON — Barry H. Landau, author and well-known presidential memorabilia collector, displayed his connections like pearls on a necklace.

Photographs of him with Catherine Zeta-Jones, Alec Baldwin and Martha Stewart adorn his Web site, adding celebrity credentials to the title he has given himself: “America’s presidential historian.”

So it was all the more noteworthy when Mr. Landau, 63, who is based in New York City, was arrested last Saturday at the Maryland Historical Society in Baltimore and charged with stealing historical documents, including ones signed by Abraham Lincoln.

Mr. Landau’s lawyer, Steve Silverman, said he expected Mr. Landau would plead not guilty. He criticized the decision to hold Mr. Landau without bail, and said he had filed a habeas corpus petition to have the ruling reconsidered....