D agmar Dolby is an American billionaire philanthropist and the widow of Ray Dolby, the visionary American engineer and inventor who founded Dolby Laboratories. Ray Dolby pioneered noise reduction and surround sound technologies that revolutionized audio quality in music, film, and television. His innovations, like Dolby Noise Reduction and Dolby Stereo, became industry standards and the foundation of a global technology company.

Upon Ray Dolby's death in 2013, Dagmar and her two sons, Tom and David, inherited the family's controlling stake in the publicly traded Dolby Laboratories. While her son David serves on the company's board, Dagmar has focused her efforts on philanthropy. She is a prominent benefactor, particularly in the fields of brain health research and reproductive rights, and has signed the Giving Pledge, committing to donate the majority of her family's wealth to charitable causes. Her fortune is a direct legacy of her late husband's groundbreaking contributions to the world of sound engineering.