Clarence Churchill Mann (February 18, 1875 - November 6, 1967), merchandise broker and entrepreneur, was born in Utica, New York, to James Ford Mann and Emma Louise Oberteuffer. Mann studied at the Phillips Academy in Andover, Massachusetts before enrolling at Harvard College in 1895. While at Harvard, Clarence served as the assistant manager of the Harvard Rowing Association and as manager of the business staff of Harvard’s newspaper, The Crimson. Mann was also one of five co-founders of the Harvard Magazine, established in 1898 as a four-page weekly publication called The Harvard Bulletin, providing current university news.

Upon graduating in 1899, Mann joined Lee, Higginson & Co., a prominent investment bank based in Boston. In 1900, he took a leave of absence from the company to serve on the staff of the Cuban Summer School at Harvard where he was in charge of the reception of the Cubans and their distribution among the various boarding-houses and dormitories. In line with the customs of the time period, Mann was also responsible for organizing chaperones for the Cuban ladies in attendance, and dealt with the occasional disagreements between the two parties including complaints of American chaperones who were too strict with the Cuban teachers, forbidding visitors in their homes after nine in the evening, and not allowing some women to leave the home alone at all, not even a married woman with children of her own.

Mann often delegated these socially delicate responsibilities, which involved mediating between cultures, to other senior chaperones volunteering with the program. He was also responsible for managing the relationships between the program heads of the Summer School, namely Alexis Frye, and Harvard University administration, like then President of the University, Charles W. Eliot. Given the importance of this program for United States foreign relations, Mann was also in contact with the office of the President of the United States, who invited Mr. Frye and the Cuban teachers to a reception at the White House during their stay.

In 1901, after his experience with the Cuban Summer School, Mann went to Cuba representing Silver, Burdett & Co., a United States primary education textbook publishing company. Mann began selling books to the Cuban government.

On May 21, 1902, Clarence Churchill Mann married his Florence Chisholm Dowling in Pasadena, California. Together, Clarence and Florence raised five children: Mary Justine, Clarence Churchill, Jr., Arthur Drummond, Gertrude Elizabeth, and Douglas.

While selling textbooks to the Mexican government in Mexico City, Mann crossed paths with a chemist who had discovered how to produce an essential oil for flavoring from citrus fruit peels. Together, they founded the San Gabriel Valley Fruit Products Company which endeavored to show the California fruit farmer that he could save oranges and lemons which did not meet shipment standards and instead use them to produce oils for sale. This in turn saved one fourth of the entire crop of oranges and lemons in a given year. Mann served as the head of finances and sales of the company, as well as its secretary and treasurer. However, after the Dingley Act of 1897 materialized, thus raising tariffs that had been lowered through the Wilson-Gorman Tariff Act in 1894, Mann and his business partner chose not to continue their orange oil industry in California. Clarence went on to become an agent for the Canada Sugar Refining Company in Toronto, Canada.

On September 24, 1924, Florence Chisholm Dowling Mann passed away, leaving Clarence widowed and a single father, his youngest only seven years old.

Eleven years later, on October 1, 1935, Clarence Churchill Mann remarried. He and his second wife, Nina Le Brun, lived in Toronto, Canada for the remainder of their lives.

Clarence Churchill Mann died on November 6, 1967 in hospital in Victoria, British Columbia, Canada. He was 91 years old.