Daniel R. Weinberg has been president and sole owner of the Abraham Lincoln Book Shop, Inc. since 1984, having previously been co-owner from 1971. Since 1933, the firm has had an international reputation as experts in the buying, selling, appraising, and authentication of historical, artistic, and museum artifacts. The shop has conducted appraisals for libraries, museums, banks, insurance companies, and private collectors.  He is a co-author of Lincoln's Assassins; Their Trial and Execution (2001) and has lectured extensively on the subject. He has appeared on both CSPAN and the History Channel. Mr. Weinberg pursued his undergraduate work, in history, at Temple University, Philadelphia, and his graduate work, in the same field, at New York University at Washington Square.