Smashburger chairman adds CEO duties

DENVER Smashburger has expanded chairman David Prokupek’s role to include chief executive duties and added three outside directors to its board for greater functional expertise, the fast-casual chain said.

New to the board of Denver-based Smashburger are:

• Mike Fries, president and chief executive of Liberty Global, a major cable TV provider claiming 27 million subscribers.
• Steve Schiffman, president and general manager of the N