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Stephan Loewentheil is an antiquarian and a rare book and photograph collector. He is the founder and president of the 19th Century Rare Book and Photograph Shop, located in New York, New York and Baltimore, Maryland. Over a career spanning four decades, Loewentheil "has excelled … in unearthing obscure bibliographic details leading to the acquisition of under-appreciated rarities, seminal documents and early historic photographic images." Loewentheil has been described as a "super-collector," whose clients include celebrities, heads of state, American presidents, and some of the most prominent private collectors and institutional clients of rare books and photographs.