Portal:Biography/Did you know/4

... that Dave Gunness (pictured) designed concert loudspeakers used by Eric Clapton, Paul McCartney, Iron Maiden, Pearl Jam, Usher, and Snoop Dogg?
... that former Israeli politician and Speaker of the Knesset Shlomo Hillel was in charge of an underground ammunition factory disguised as a laundry facility during the British Mandate of Palestine?
... that Hasan ibn Zayd, the founder of the Zaydid emirate of Tabaristan, was succeeded by his brother Muhammad, who lost it to the Samanids?
... that Thomas Jefferson Ramsdell built the opera house where James Earl Jones started his career?
... that British physiologist Mabel Purefoy FitzGerald attended Oxford before women were granted degrees and 75 years later received an honorary master's when she was 100 years old?
... that Fredrik Magnus Piper introduced the English landscape garden to Sweden?
... that although Kosta Manojlović was instrumental in the establishment of the Belgrade Music Academy, serving as its first rector, he was forced to retire from it for political reasons?