William continued working in the livery business, later bought a horse and carriage and went into the taxi business, one of the first taxi services in San Francisco. When automobiles were manufactured, he bought a limousine and continues in the taxi business until he bought out William Green Undertakers in 1916. In 1915, William was issued a license as an embalmer after a course of study.
Entries into the San Francisco Directory:
1916- “Duggan and O’Rielly,” 1230 Valencia Street
1922- “Duggan & Carroll,” 1230 Valencia Street
1923- “William Duggan & Co.”
1929- “Duggan’s Funeral Service,” 3434 Seventeenth Street