I want to know the answer to the following question:
Who did Sprague work for early in his career?
All the background I'm provided with is that "Other Sprague electric inventions about this time greatly improved grid electric distribution (prior work done while employed by Thomas Edison), allowed power from electric motors to be returned to the electric grid, provided for electric distribution to trolleys via overhead wires and the trolley pole, and provided controls systems for electric operations.". Is that enough to answer the question?