He has also played professionally for EWE Baskets Oldenburg, Aguas de Valencia Gandía Bàsquet, CB Valladolid, and Bnei Hasharon.

[2][3] His grandmother is a Holocaust survivor whose life was saved twice by Swedish diplomat Raoul Wallenberg―once as a beneficiary of the false citizenship documents that Wallenberg issued to Jews in Hungary, and later when he convinced Nazi guards not to gun down the 80,000 Jews left in the Budapest Ghetto at the end of World War II.

Due to this, Grunfeld grew up a die-hard Knicks fan, but was just an average player on his middle school team during the late 1990s.

[4] After going undrafted out of Stanford in 2006, he played his first two professional seasons with the EWE Baskets Oldenburg in the German Basketball Bundesliga, then with Aguas de Valencia Gandía in Spain's LEB Oro League.

[11] Due to the team's financial problems at the beginning of the 2011 season, he was released and signed a two-year contract with Hapoel Jerusalem.

He is one of a number of American Jews who played in Israel, including Jon Scheyer, Sylven Landesberg, Glenn Consor, and David Blu.

[10][12][13] After retiring from basketball, Grunfeld received an MBA degree from Stanford University and began a career as a technology executive in Silicon Valley.