His current research focuses primarily on power MEMS/NEMS, including motors, generators, relays, switches, pumps, and valves, some of which have demonstrated record power and/or torque densities. He has also worked to develop various MEMS sensors. Prof. Lang has often collaborated on cross-disciplinary projects, such as his recent development of high-torque-density motors for use in the MIT Cheetah Robot, which should allow the machine to reach speeds of up to 35 mph.

Professor Lang's research and teaching interests focus on the analysis, design and control of electromechanical systems with an emphasis on rotating machinery, micro-scale (MEMS) sensors, actuators and energy converters, and flexible structures.