- A limited partner in the New York Yankees.
- Baseball memorabilia collector. Fetched a record $21.8 million during a week long auction at Sotheby's in 1999. Among the items was Joe DiMaggio's 1950 World Series ring and a letter he wrote to Marilyn Monroe, both of which DiMaggio's lawyer accused Halper of illegally acquiring. A game-used Mickey Mantle glove was purchased by Billy Crystal for $239,000.
- Was the owner of one of the most massive collections of baseball memorabilia and a limited partner in the New York Yankees sports team.
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