Stewart Rahr was the owner of pharmaceutical and generics wholesaler Kinray, which was the largest privately owned pharmaceutical distributor in the world. Kinray was bought out by Cardinal Health in 2010.

Starting from his family-owned pharmacy business in Brooklyn

Brooklyn

Brooklyn is the most populous of New York City's five boroughs, with nearly 2.6 million residents, and the second-largest in area. Since 1896, Brooklyn has had the same boundaries as Kings County, which is now the most populous county in New York State and the second-most densely populated...

, New York, Rahr expanded his business to a wholesale operation that served 4000 pharmacies in the Northeast, with revenues of over $5 billion.

He is the largest individual Make-A-Wish donor in the world. He is also noted for the house he purchased in the Hamptons

Hamptons

The Hamptons may refer to several villages and hamlets in the towns of Southampton and East Hampton on the far east end of Suffolk County in Long Island, New York. These townships occupy the South Fork of Long Island, stretching into the Atlantic Ocean. The Hamptons form a popular seaside resort,...

 for $45 million, reportedly the highest price ever paid in the state for a single-family home.

According to Forbes

Forbes

Forbes is an American publishing and media company. Its flagship publication, the Forbes magazine, is published biweekly. Its primary competitors in the national business magazine category are Fortune, which is also published biweekly, and Business Week...

, he is the 330th richest American, and 879th richest person in the world with an estimated worth of $1.4 billion in 2011.