Before coming to New York in 1993, Rosenblatt was editor of the Baltimore Jewish Times for 19 years. He has won numerous awards for his writing from secular and Jewish organizations. His analysis of the Simon Wiesenthal Center of Los Angeles was a finalist for the Pulitzer Prize in the category of Special Reporting in 1985. The honor marked the first time an article in a Jewish publication was cited in the Pulitzer competition, which dates back to 1917. His investigative reporting on a rabbi's abuse of teens received national acclaim. It won the Casey Medal for Meretorious Journalism in 2001, and led to the arrest and conviction of the rabbi.
Rosenblatt is chairman of the Fund for Jewish Investigative Journalism and founding director of Write On For Israel, a Jewish Week-sponsored advocacy journalism program for high school students.