Presstek, Inc., a provider of direct digital imaging technology, announced that Mike Agahee has joined the company as senior sales executive, southwest.      In this role Mr. Agahee is responsible for managing, developing and expanding sales of Presstek’s CTP and DI products in the southwest markets. Mr. Agahee brings more than 20 years of digital printing sales and customer experience to Presstek. Most recently, he served as western sales manager for Xeikon America, Inc....