The Great Time Machine Race

It's on... (Or will be.) (Or has been.) Take your pick between the Verdrehung Fan(TM) and the Space-Time Twisting By Light project. 

Marshall Barnes, R&D Eng, is working on the Verdrehung Fan(TM) which involves effecting time with specially synthesized electromagnetic fields. Meanwhile, the plan from Ronald L. Mallett, PhD utilises a rotating ring laser generating a gravitational field that then twists space and time.