Youth violence is a major issue in Chicago. When we started working with Chicago Public Schools (CPS) in June 2009, more than 500 students had been shot and more than 50 students had been killed over the past two school years. Our team developed a comprehensive action plan to address the problem, including a risk model that identifies each student's likelihood of being shot. This revealed that 200 students were statistically about 50 times more likely to become victims of gun violence than the average student. This knowledge enabled CPS to prioritize and reach out to these students with personalized interventions. Early results have been very encouraging—both shootings and homicides were down 16 percent last year. I'm incredibly proud of the impact we've made by applying our commercial took kit to a very important social problem.

Mark joined BCG in 2006, after spending four years at an import-management consulting firm and three years at Compaq.

He earned a BA in international studies from The College of William and Mary, and he also holds an MBA from the University of Chicago Graduate School of Business.