For 6 years he taught school in Alabama, and held a professorship at his alma mater Alabama State Normal School in 1879. In 1882, Curtis was appointed to a
clerkship in the
Bureau of Pensions in Washington. D.C. While living in D.C., he started taking an interest in studying medicine. Curtis attended
Howard University College of Medicine (HUCM), graduating in 1888. After graduating from HUCM, he served as a special agent in the pension office in Illinois and Nebraska from 1889 to 1891. In October 1891, Curtis moved to Illinois, and established a medical practice in Chicago, located at 5003
Dearborn Street. He also worked as medical staff at
Provident Hospital, Chicago. In June 1898, Curtis enrolled in the
8th Regiment Illinois Infantry during the
Spanish–American War, and he was appointed as
first lieutenant (assistant surgeon). He was stationed at
Palma Soriana, Cuba from August 22, 1898, to February 13, 1899, where he worked as a medical officer for a detachment (companies E and F). Curtis was hospitalized for
malaria with
dysentery in February, and left for Chicago by April. In September 1899, Curtis applied for a new contract, and served in the African American 48th Volunteer Infantry in the Philippines. He was first on duty at
Caloocan, with the 3rd Battalion; followed by duty at La Loma Church with the 1st Battalion; and then duty at
Alilem, Quimpusa, and
Tagudin. He returned to the United States, via San Francisco, on June 30, 1901. His obituaries reads that he returned to the Philippines, staying for three years before returning to practice medicine in Chicago. == Death and legacy ==