Brian Wallis, deputy director of exhibitions and collections and chief curator at the International Center of Photography since 1999, will step down at the end of the month.

During Wallis’s tenure, ICP acquired more than 20,000 photographs and staged over 150 exhibitions and installations. He previously served at the Solomon R. Guggenheim Museum, the Museum of Modern Art, and the New Museum of Contemporary Art. He’ll be working as curator for the Walther Collection.

Said executive director Mark Lubell, “Brian Wallis has had a long and distinguished career at ICP. He came on board before our renovated Midtown galleries opened in 2000 and has been instrumental to our success over the last fifteen years.”