Jeff is known for his ability to customize his routine to his particular audience. His style is smart, clean, and classic. He has performed several times on The Late Show with David Letterman and The Late Late Show with Craig Ferguson. He has also appeared on Comedy Central and SiriusXM Radio. Caldwell is by no means a career comedian. Before taking to the stage he was a civil and environmental engineer. As such, he often writes articles for the Huffington Post in which he comments on science news in a whimsical fashion. Talk about combining the best of both worlds!