The New York City Mental Health Service Corps (MHSC) is a key initiative of Thrive NYC: A Mental Health Roadmap for All– a comprehensive public health approach to mental health designed to promote and protect the wellbeing of all New Yorkers. The MHSC fills the too long neglected gaps in mental health and substance use services throughout NYC by creating a corps of approximately 400 mental health clinicians placed in high-need communities. Through best practices and a better design of care, the initiative will increase the diversity of behavioral health clinicians in the workforce and strengthen care where it is needed the most.