Career
Unlike some stamp collectors who collect stamps of many countries, Hart restricted his collecting to narrow views of American philately. He was a specialist in the postage stamps of the United States 1847 issue and postal history related to that issue. He also specialized in collecting covers containing the free franks of American presidents and their widows.
Along with Susan Marshall McDonald, Hart co-authored the “Directory of 10¢ 1847 Covers” which was published in 1970, and expanded by Hart afterwards.
Foreign many years, Hart was an editor at The Chronicle of United States. Classic Postal Issues, where he was responsible for editing the 1847-1851 section.
