SXM's MC Departs: SiriusXM's The Highway The Storme Warren Show mornings co-host Mary Carlisle “MC” Callahan departed last month after three-and-a-half years. "It has been the most hilarious, magical, exciting three-and-a-half years that I can't believe I got to call a job," shares Callahan via Instagram. "Our whole team became a family to me, and not waking up before the sunrise and with our Highway [family] is gonna take some getting used to." Sr. Dir./Country Programming J.R. Schumann is looking for Callahan's successor. Candidates should have a minimum of three years of experience in major market radio or related hosting experience. See the complete job description and apply here.