For Mullen, creativity is an indispensable component of the scientific method and he enjoys the iterative process of testing different hypotheses and problem-solving approaches. He also hopes to make his work accessible using code, 3D designs, and data that other researchers can easily build upon.
In his spare time, Mullen enjoys snowboarding, fly fishing, and floating down rivers in his raft. When at home he can usually be found playing the guitar or cooking.