Gustav Friedrich Hermann Maass (December 2, 1830 – April 28, 1901) was a German botanist who was a native of Brandenburg an der Havel.
In 1848 he became an assistant to agriculturalist Hermann von Nathusius (1809–1879), and from late 1849 spent twelve-plus years in the military as an artilleryman in the 3rd Brandenburg Artillery Brigade, as a Brigadeschule instructor at Magdeburg and as an assistant to the brigade staff in Berlin. In 1862 he became a manager in the Magdeburgischen Land-Feuer-Societät in Altenhausen, a position he maintained until his death in 1901.
In 1866 Maass was co-founder of the Walbeck "Aller Association", and was its chairman from 1874 to 1896. Within this association he performed extensive studies of flora in areas surrounding the Ohre and Aller Rivers. With Paul Ascherson (1834–1913) and Ludwig Schneider (1809–1889), he took part in extended botanical excursions. Results from these field studies were incorporated into Schneider's book Flora von Magdeburg.
Gustav Adam Maass Jr. (1893–1964) was an American architect working primarily in the Mediterranean Revival style who designed public buildings and private homes in and around Palm Beach, Florida from the 1920s until his death in 1964.
Gustav Maass was born in New Orleans, the third of eight children of German immigrants. His father was a mechanical engineer. Maass grew up in New Orleans and Birmingham, Alabama. He received a degree in architecture from the University of Pennsylvania in 1917, and worked during World War I in the U.S. Civil Service at League Island Navy Yard in Philadelphia. After the war, Maass returned to Birmingham, where he designed a variety of structures, including a Masonic Temple, power plants, schools, churches, and houses.
In 1921, Maass joined Harvey and Clarke in West Palm Beach, where he participated in the design of railroad stations on Florida’s east and west coasts, including the Delray Beach Seaboard Air Line Railway Station, the Deerfield Beach Seaboard station, and the Homestead Seaboard station. Maass designed many buildings in Delray Beach in the 1920s; his Art Deco style was reflected in commercial buildings along Atlantic Avenue.