The production of mathematical models was part of Brill's efforts in teaching but he also published impressive research papers and books. For example, while at Munich he published HöhereKurven (1880), ZurTheorie der geodätischenLinie und des geodätischenDreiecks (1883), and Bestimmung der optischenWellenflächeauseinemebenenCentralschnittederselben (1883). Although Klein left Munich in 1880, Brill was to remain there for a few more years, taking up the chair of mathematics in the University of Tübingen in 1884. Brill held this chair until he retired in 1918 at the age of 76, but continued to live and do mathematics in Tübingen after his retirement until his death at age 92.