Greg Moore, the editor of the Denver Post, announced Tuesday he will resign after 14 years at the newspaper's top editorial position.

Moore, who's leaving on April 1, said a desire for "new challenges" prompted his departure, according to The Denver Post. During his tenure, he led the Post to four Pulitzer Prizes, including one for its coverage of the Aurora, Colorado theater shooting that left 12 dead and 58 injured.

Lee Ann Colacioppo, the paper's news director, will succeed Moore in the interim, according to The Denver Post.

The departure is significant in part because The Denver Post is the flagship publication and headquarters of Digital First Media, a newspaper chain with holdings across the United States.

Moore was also one of the few black editors atop the masthead at one of America's major newspapers, which suffer from a lack of diversity among rank-and-file positions but especially among their upper editorial strata.

During Moore's tenure, The Denver Post has undergone multiple rounds of layoffs: In 2015, it shed 20 positions from its newsroom of 165; in 2012, the paper did away with much of its copyediting staff in a reorganization of its production process.

Digital First Media has undergone tumult of its own in the years since Moore was named editor at The Post. Steady declines in print revenue have afflicted the chain, which has over time shed more than 100 newsroom jobs under the parentage of primary owner Alden Global Capital. A thwarted attempt by the company to sell itself for $400 million in 2015 was followed by the departure of former CEO John Paton. Thunderdome, an attempt to centralize news production of national news in a single New York newsroom, imploded in 2014 and was followed shortly by the departure of former top editor Jim Brady.