Gallagher grew up in the ski resort town of Mammoth Lakes, California where he was the quarterback for the Mammoth Huskies high school football team. He graduated from high school in 1979. Gallagher studied at the University of San Diego and he majored in business[1] playing quarterback for the Torero football team.[2]
On February 1, 2010, The Live Desk was replaced with America Live with Megyn Kelly. Gallagher continues to anchor and report on Fox programs.[3]
On September 21, 2022, he was named permanent host of Fox News @ Night, replacing founding host Shannon Bream after she was named host of Fox News Sunday. He has been hosting the program since October 3, 2022.[4][5]