Over the past two decades, Kenny Leon has done more than any other director to bring major and rising Black artists to Broadway, including stars such as Denzel Washington and Audra McDonald and playwrights ranging from Lorraine Hansberry and August Wilson to Katori Hall. Two years ago, Mr. Leon helmed back-to-back productions of Suzan Lori-Parks’s Pulitzer Prize-winning “Topdog/Underdog” and Adrienne Kennedy’s “Ohio State Murders”; the latter, written in the early ’90s, marked the Broadway debut of a revered scribe who had just turned 91.