James B. Milliken (right) announced Tuesday that he will step down as chancellor of the City University of New York at the end of the current academic year. In a message to CUNY students and faculty members, Milliken said he was proud of the progress of the university system in improving graduation rates and promoting economic mobility for a student body of half a million. Milliken noted that the last year was challenging. He was diagnosed with throat cancer nine months ago. While the treatments have given him a good prognosis, he noted that the experience has been "draining physically and emotionally." Milliken also noted turnover on the CUNY board, and that only 2 of the 17 trustees on the board today were among those who recruited him in January 2014.