Darwin Teilhet

Teilhet was born in Wyanet, Illinois, to a Dutch mother, and a father of French descent. As a teenager, he traveled in France and worked as a juggler in a circus there. He wrote a monthly column on broadcast radio for Forum magazine from 1932 to 1934 whilst he headed the broadcast radio advertisement unit of N. W. Ayer & Son. Teilhet was an officer in the Office of Strategic Services serving first in making propaganda in Washington D.C. before being transferred to London and attaining the rank of major. He was scheduled to perform intelligence operations during Operation Overlord, yet was sent home to America after contracting pneumonia. He later became executive assistant to the president of Dole Pineapple in Hawaii.

Teilhet created his main detective protagonist, Baron von Kaz, a Viennese, at the instigation of James Poling of Doubleday Books. He wrote some of his mystery novels with his wife, Hildegarde Tolman Teilhet (November 22, 1905 – January 24, 1999). Novels were published by Darwin Teilhet, Darwin L. Teilhet, Darwin and Hildegarde Teilhet or his pseudonyms, Cyrus Fisher (juvenile fiction), William H Fielding and Theo Durant. Teilhet was a Newbery Honor award winner for his Cyrus Fisher novel, The Avion My Uncle Flew.

Darwin LeOra Teilhet (May 20, 1904 – April 18, 1964) was an American mystery novelist, advertising executive, journalist and a film screenwriter and consultant.

Teilhet chose the pseudonym "Cyrus Fisher" as a tribute to his late father-in-law, Cyrus Fisher Tolman (1873–1942), Professor Emeritus of Economic Geology at Stanford University, as well as a tribute to his son Cyrus Jr. who died suddenly at the age of three months. There is a "Cyrus Fisher Tolman Professor in the School of Earth Sciences" professorship named in his honor, at the Woods Institute for the Environment, Stanford University.