“Meet Chicago’s next generation of leaders, which include Symbol Training Institute’s Executive Director, Diana Peters. Since Crain’s launched its annual 40 Under 40 feature in 1989, nearly 1,000 up-and-coming Chicagoans have earned the title. Barack Obama, Oprah Winfrey, Rahm Emanuel, Billy Corgan, Lisa Madigan, Nate Silver, Grant Achatz, Alpana Singh and Mary Zimmerman have shared the glory.