Cornelis Bronsgeest (24 July 1878 in Leiden - 22 September 1957 in Berlin) was a Dutch bass-baritone who made his career in Germany.
Born to a bourgeoisie catholic family from Leiden cultivating arts and after discovering his musical talent, Bronsgeest decided to give up career as an architect and became an opera singer, touring internationally.
He led this flying Opera Society, staging singers including Anton Sistermans, Gemma Bellincioni, Emmy Bettendorf, Leo Schutzendorf, Frida Leider and Louis Morrison.
He directed Berlin's first postwar Opera performance on August 12, 1945 (Rossini’s Barber of Seville), singing the Role of Count Almaviva.
She was the niece of Themistocles Gluck (1853-1942 in Berlin) the German physician and surgeon and major contributor to the history of Orthopaedics science and the sister of two famous German neuropsychiatrists, Otto Kant (Contributor to the Vienna Circle, Zur Biologie der Ethik, 1932 ) and Fritz Kant who have emigrated to the US in 1933.