As chief investment officer of the hedge fund Viking Global Investors, Daniel helped oversee $32 billion in assets (he got his start there as an entry-level analysts). After raising $4 billion he set out to establish his own fund, and his New York-based D1 Capital Partners fund amassed around $5 billion in early 2018 and reported an initial 11.8% gain. The companies private investments have included Instacart and Juul, the e-cigarette manufacturer. According to Business Insider, D1 Capital Partners placed a short bet worth about $243 million against Adidas, whose stock was at a near six-month high. Over the years Daniel and Brett have endowed the Institute of Contemporary Art at the University of Pennsylvania and provided major support for several high-profile exhibitions of contemporary work, including retrospectives of Jeff Koons at the Whitney Museum in 2014 and Christopher Wool at the Guggenheim Museum in 2013. They are also known patrons of the Metropolitan Museum of Art. In 2015 the couple bought nearly the entire 15th floor of the Rosario Candela-designed building at 778 Park Avenue in New York for $28.5 million.