Jason Alexander, better known as George Costanza on the popular NBC comedy “Seinfeld,” will speak to members of the Sheet Metal and Air-Conditioning Contractors’ National Association.

Alexander will entertain attendees with his portrayal of “Donny Clay,” known as “America’s fourth-leading motivational speaker.” The performance is a send-up of inspiration speakers such as Tony Robbins, Deepak Chopra and Dr. Phil McGraw. The comedy show will be specially tailored for the sheet metal contractors and will showcase Alexander’s talents using live and filmed comedy, musical numbers and magic.

SMACNA’s 70th annual convention takes place at the Grand Wailea and Wailea Beach Marriott hotels on Hawaii’s Maui Island. For more information on speakers and business sessions at this year’s event, visit www.smacna.org.