The fast-growing tech sector has become NYC's most reliable source of new well-paying jobs. But while tech companies are hungry for talent and increasingly eager to hire locally, too few of the good jobs in tech are going to New Yorkers from low-income communities. This report points the way forward, providing the first-ever comprehensive assessment--and map--of New York City's tech education and training ecosystem. This study, which takes a close look at both computing education programs focused on children in the K-12 system and adult-oriented tech workforce training programs, finds that the city's tech skills-building ecosystem has come a long way in recent years. There are now at least 238 tech education and training organizations operating 506 programs in 857 locations across the five boroughs, and that does not include the exciting work underway in city schools to deliver on Mayor de Blasio's commitment to offer computer science in every public school by 2025. However, the city has relatively few programs focused on children in grades K-5, a potential problem given growing evidence that early exposure to foundational STEM education can make a big difference in closing achievement gaps for low-income students and shaping early attitudes toward technology careers. Similarly, not enough of the K-12 programs are focused on developing computational thinking skills, though researchers and tech employers say that introducing young people to core concepts of computational thinking is an essential building block for future success in tech fields. The city can do more to expand access to tech careers by strengthening the city's tech skills-building ecosystem and preparing thousands more New Yorkers for the jobs of the future. [This report was written with Sarah Amandolare, Jenna Chambers, and Charles Shaviro. This report was published with Tech:NYC. This study was made possible by the Robin Hood Learning + Technology Fund, Bloomberg, and Verizon.]