Peter Max, the artist whose vibrant, psychedelic designs came to symbolize the optimism and spirit of the 1960s counterculture, died on Monday in Manhattan at the age of 88. His son, Adam Max, confirmed the death but did not disclose a cause. Max had long been battling dementia.

Born Peter Max Finkelstein on October 19, 1937, in Berlin to a Jewish family, Max’s early life was marked by displacement. His family fled Nazi Germany for Shanghai, later lived in Tibet and Israel, before settling in New York City when he was 16. His exposure to diverse cultures and an early fascination with astronomy and Eastern spirituality would deeply inform his art.

Max emerged as a major figure in the 1960s art scene with his iconic use of bright colors and bold, graphic motifs, including flowers, butterflies, rainbows, stars, and planets. His style drew from Art Nouveau, Op Art, and psychedelic art, creating instantly recognizable images associated with the era’s “flower power” movement. Max preferred expanding consciousness through yoga and spirituality rather than drugs, and his work frequently reflected themes of peace, joy, and universal love.

His art reached a broad audience through millions of posters and extensive licensing agreements that placed his designs on products ranging from bedspreads and clothing to airplanes and postage stamps. Notably, Max designed the 10-cent U.S. Postal Service stamp for the 1974 World’s Fair in Seattle and contributed official artwork for major events including the Olympics, the Super Bowl, the World Cup, and the Indianapolis 500.

Throughout his prolific career, Max's art appeared in many public spheres, including advertising campaigns for the American Cancer Society, the Peace Corps, and the United Nations. His work was widely accessible, appearing on transit posters in ten major U.S. cities and products in over 70 companies. He was also associated with cultural landmarks including MTV’s logo in the 1980s and the official 1994 World Cup poster. However, contrary to some popular belief, Max was not involved in creating the artwork for the Beatles’ film "Yellow Submarine," which was produced by Heinz Edelmann.

After reaching dizzying heights of popularity in the late 1960s, Max briefly withdrew from the commercial art world in the 1970s, citing creative exhaustion. He eventually returned with projects such as a collection honoring each U.S. state for the American Bicentennial and a series of portraits of the Statue of Liberty painted at the invitation of First Lady Nancy Reagan.

Max’s later years were marked by legal and family disputes. In 1997, he pleaded guilty to tax fraud, resulting in a work-release sentence and financial penalties. His personal life also attracted media attention, especially conflicts between his second wife, Mary Balkin, and his son Adam over control of his finances and artwork. Mary Max died in 2019 amid those ongoing controversies.

Although reports indicated that Max’s advancing dementia led him to rely heavily on studio assistants who produced much of his later work, his daughter, Libra Max, took control of his studio in 2019 to restore his legacy and focus on his early creations.

Peter Max is survived by his children, Adam and Libra Max. His vivid, joyous art remains emblematic of the hopeful, idealistic 1960s counterculture, often described by Max himself as visual music for the youth of his time.