They may cheer for the Golden Bears or the Tigers or the Crimson now, but they have roots with the Cardinal and the Tree. Four Stanford alums are among the 24 newly anointed winners of 2009 MacArthur Fellowships, commonly known as “genius grants.” DANIEL SIGMAN, professor of geological and geophysical sciences at Princeton, earned his bachelor’s degree from Stanford in 1991. L. MAHADEVAN, a professor of applied mathematics at Harvard, holds master’s (1992) and doctoral (1995) degrees from Stanford. LIN HE, assistant professor in the Department of Molecular and Cell Biology at Berkeley, received her PhD from Stanford in 2003. MANEESH AGRAWALA, associate professor in the Department of Electrical Engineering and Computer Sciences at Berkeley, received a bachelor’s degree from Stanford in 1994 and a doctorate from the Farm in 2002.