Thomas Kren, the associate director for collections at the J. Paul Getty Museum, will retire after more than 35 years, the museum announced Thursday.

When Kren leaves the Getty in October, Richard Rand, senior curator of paintings and sculpture at the Clark Art Institute in Williamstown, Mass., will replace him. Rand began his career at the Los Angeles County Museum of Art in 1989.

Kren arrived at the Getty in 1980 as the associate curator of paintings. In 1984 he became the first senior curator of manuscripts, a position he held until 2010, when he took on his current role.