 The Zeta Chapter of Psi Upsilon International Fraternity ( " Psi U " ) was founded at Dartmouth in 1842 , the first fraternity at Dartmouth College . In 1907 , Psi Upsilon built the wood frame house it still occupies , designed by noted New Jersey theater architect and Dartmouth alumnus Fred Wesley Wentworth . Several additions during the latter half of the twentieth century greatly improved the structure , which houses around twenty brothers each year . The house most recently underwent substantial renovations during the spring of 2006 . F. Scott Fitzgerald famously enjoyed the 1938 Winter Carnival in the Psi Upsilon chapter house . The Zeta chapter creates an ice pond in its yard every winter and is known as the " keg jumping fraternity " for its most @-@ popular Winter Carnival activity . Prominent alumni of the Zeta chapter of Psi Upsilon includes former United States Vice President Nelson Rockefeller ' 30 , and billionaire hedge fund manager of Lone Pine Capital , Steve Mandel ' 78 . 
