This September, CHI St. Joseph Children’s Health will welcome a famous “doctor” to participate in its “Conversations about Healthy Communities” series next month. Julius “Dr. J” Erving, the NBA superstar and Basketball Hall of Famer who popularized the slam dunk, will discuss his vision of a healthy community at 7:30 p.m. on Monday, Sept. 26 at the Lancaster County Convention Center, 25 S. Queen St., Lancaster.