Cullen's American Grille & Whisk(e)y Bar has named new leadership following the unexpected death of Ryan Roberts, who served as general manager. The upscale restaurant in Clear Lake has hired Mario Plaza to fill Robert's former role, according to CultureMap. Meanwhile, executive chef David Coffman has departed from the restaurant and has been replaced by Daniel R. Terrell. Plaza previously served as director of restaurant operations at the Royal Sonesta Hotel in Houston and most recently as the...