San Francisco Bay Area-based Karl August Baumgaertel was born on November 28, 1893. He was a Corporal in the US Marine Corps in World War I. He became an accomplished salon photographer in the 1920s and 1930s. Despite a prolific career very little is found on his life or education. However, it is known that he was a member of the Associated Camera Clubs of America (based in San Francisco) and the Pictorial Photographers of America (PPA), for whom he was also the Pacific Coast Executive for a time. He showed throughout the United States, including the Pittsburgh Salon of Photographic Art, the Chicago Camera Club Century of Progress International Photographic Salon (1933), and the Camera Pictorialists of Los Angeles. He was a charter member of the Photographic Society of America, and he showed at the Golden Gate International Exhibition of 1939. In addition to his professional camera work, he wrote the column "In Focus" for View Finder magazine.

His photgraphic archive is at the Bancroft Library, Berkeley,California. For his subject matter, he focused on cityscapes and landscapes of the West, with special attention to the San Francisco Bay Area and the geological formations of the Southwest. He died in San Francisco on 19 October 1958 and is buried in Golden Gate National Cemetary in San Bruno, California.