Doug Van Dyke of Leadership Simplified will discuss "The Art of Leadership" from 2 to 4 p.m. on Tuesday, May 3, at the Manatee Chamber of Commerce, 4215 Concept Court, Lakewood Ranch. Van Dyke is an executive coach and leadership development expert who has appeared on television and radio business programs. Tickets are $79 for Chamber members and $99 for non-members.