New York’s International Center of Photography (ICP) will lose longtime chief curator and deputy director of exhibitions and collections Brian Wallis at month’s end. He has accepted a post as curator at the Walther Collection, in Neu-Ulm/Burlafingen, Germany.

Since Wallis joined the museum in 1999, the ICP has added over 20,000 photographs to its holdings and hosted more than 150 exhibitions and installations. The institution has also embraced a more contemporary curatorial program, taking a historical look at photojournalism and documentary photography. During his tenure,Wallis curated such exhibitions as “Weegee: Murder Is My Business” (2012) and “Larry Clark” (2005), and co-curated “The First ICP Triennial of Photography and Video” (2013).

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

Previously, Wallis had been on staff at the Solomon R. Guggenheim Museum, the Museum of Modern Art, and the New Museum of Contemporary Art, all in New York. At the Walther Collection, his first exhibition will be “The Order of Things: Photography from The Walther Collection,” scheduled to open in May.

Wallis’s departure is not the only change underfoot for the ICP: the museum was unable to renew its lease on its midtown space (see International Center of Photography Set To Close Its Midtown Museum), where it recently hosted its final exhibition, “Sebastião Salgado: Genesis.” It plans to reopen in the fall in a new location on the Bowery (see International Center of Photography Will Move to the Bowery). The museum is also opening a new collections center and media lab in Jersey City at Mana Contemporary.