Alex Filippenko

Alex Filippenko

Renowned astrophysicist, popular Berkeley professor, and a leading researcher celebrated for groundbreaking contributions to the discovery of the accelerating expansion of the universe and the study of supernovae and dark energy.

Renowned UC Berkeley astronomy researcher and professor Alex Filippenko has been voted the โ€œBest Professorโ€ on campus a record nine times. Filippenko makes the greatest mysteries of the universeโ€”from the enigmatic force of dark energy to the fate of stars and the search for alien lifeโ€”totally accessible and thrilling for any audience, blending cutting-edge scientific insights with contagious enthusiasm and humor. His animated, energetic delivery and knack for telling mind-expanding stories help audiences grasp not only how cosmic discoveries happen, but why they matter for humanityโ€™s place in the universe. 

One of the Festivalโ€™s most popular past speakers, Alex Filippenko, returns to Sonoma in 2026 with an extraordinary story to tell. Fresh from his remarkable journey to the geographic North Pole, where he conquered the North Pole Marathon โ€” 26.2 miles across the frozen Arctic Ocean โ€” Filippenko will take audiences on a visual and emotional expedition through one of Earthโ€™s most extreme environments. With breathtaking photographs and vivid accounts, heโ€™ll share moments beneath the midnight sun, reveal dazzling atmospheric phenomena, and describe encounters with aweโ€‘inspiring Arctic wildlife โ€” from polar bears to blue whales โ€” set against a backdrop of ice, sea, and sky.

As one of the worldโ€™s most cited and accomplished astrophysicists, Filippenko excels at taking even complex topicsโ€” such as the accelerating expansion of the universe or celestial threats to life on Earth โ€” and transforming them into eye-opening, awe-inspiring journeys that leave listeners informed, entertained, and deeply inspired.

Filippenko will also again host the festival’s popular Stargazing on the Lawn event on Saturday night. Using his most powerful portable telescope, he will project images from space onto a screen while acting as our tour guide through deep space. 

Filippenko is the only person to have been a member of both teams that revealed the accelerating expansion of the universe, a discovery that was honored with the 2011 Nobel Prize in Physics to the teamsโ€™ leaders.

Filippenko received a B.A. in physics from UC Santa Barbara and a Ph.D. in astronomy from Caltech. His research focuses on supernovae and active galaxies at optical, ultraviolet, and near-infrared wavelengths, as well as on black holes, gamma-ray bursts, and the expansion of the Universe.

Alex Filippenkoโ€™s book

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