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Alexander Haimann RDP FRPSL is an American philatelist, curator and collector of rare stamps and postal history. He began collecting at seven, when a grade-school teacher in Metro Detroit brought worldwide stamps to a geography lesson. At fifteen he took his first booth at the APS StampShow, and he was the youngest dealer with a booth at the Washington 2006 World Philatelic Exhibition.

From 2005 to 2010 he worked in the Collections Department of the Smithsonian National Postal Museum. He was on the team that launched Arago, the Smithsonian's first virtual museum collections website, and he created online exhibits and school programs for the public.

In 2008 he proposed the American Philatelic Society's Young Philatelic Leaders Fellowship, which has mentored more than 35 young collectors over fifteen years. He later chaired the APS Board of Vice Presidents and its Campaign for Philately Committee, and he has sponsored more than 800 new APS members. Elected a Fellow of the Royal Philatelic Society London in 2015, he is the Society's USA Representative and sits on its Council.

With historian Ian Knight he co-curated Clash of Empires: The 1879 Anglo-Zulu War at the Society's London museum in 2023, which drew more than 2,000 visitors from 29 countries. In 2026 he co-curated From Empire to Commonwealth at the Boston 2026 World Stamp Expo and signed the Roll of Distinguished Philatelists, philately's highest honor.

After a career in small-business software, he joined Cherrystone Auctions as Executive Vice President in 2025. He holds an MBA from Washington University in St. Louis and lives in the St. Louis area.