Dr. Ray Dolby, founder and guiding force behind Dolby Laboratories from 1965 to 2009, died on Thursday at his home in San Francisco, CA, according to an announcement by the company. He was 80.

The exact circumstances of Dolby’s death were not included in the announcement, but he lived with Alzheimer’s disease for several years and was diagnosed with acute Leukemia in July of this year. During those 80 years of life, he amassed a fortune of approximately $2.9 billion dollars, was awarded more than 50 U.S. Patents, and fundamentally changed how we watch and listen to media in the modern world.