It’s a well documented story: https://www.technologyreview.com/1999/01/01/236818/melted-chocolate-to-microwave/ https://www.technologyreview.com/1999/01/01/2368

It’s a well documented story: https://www.technologyreview.com/1999/01/01/236818/melted-chocolate-to-microwave/ https://www.technologyreview.com/1999/01/01/236818/melted-ch... It was Percy Spencer - fourth employee at Raytheon (third employee was Vannevar Bush, for reference)