This article reports the promising outcomes of a new mentoring program that helps novice teachers in New York City improve their quality of teaching and stem the number of those who leave. Calling the program "possibly the largest, most aggressive overhaul of teacher induction in the country," researchers of the New Teacher Center at the University of California, Santa Cruz, praised the 1.1 million-student district for spending $36 million to put experienced teachers on the job as full-time mentors, able to give new teachers at least 1 and 1/4 hours a week of individual coaching. The New Teacher Center, which supports the development of models centered on mentors for new educator induction around the country, was a partner with the district and the United Federation of Teachers in designing the program.