On July 15, 1908, Copeland married Frances Spalding. The same year, Copeland moved to
New York City to take a position as dean at the
New York Homeopathic Medical College and Flower Hospital. Copeland left his position as dean in 1918 in order to serve as President of the
New York City Board of Health. He was appointed to this position by Mayor
John Hylan in May 1918. However, he decided to permit motion picture theaters to remain open. He considered closing the theaters to have little effect in reducing the epidemic as long as the crowded transportation lines continued to operate. Copeland also left the city's schools open, arguing it was better, "to have the children under the constant observation of qualified persons than to close the schools". New York City,
Chicago and
New Haven, Connecticut were the notable exceptions of most cities closing their own schools during the epidemic. In December 1918, he amended the city health code to require that landlords maintain heat in apartments they rented. This had been a major issue in light of coal shortage earlier that year, numerous eviction cases around failure to provide heat, and the widespread
1918–1920 New York City rent strikes. During the epidemic, Copeland organized a system of emergency health districts to provide localized care. If individuals who lived in apartments or private residences contracted the virus, they were
quarantined and care was provided to them in their house. However, if individuals who lived in
tenements or
boarding houses contracted the virus, they were moved to city hospitals. Copeland served a total of five terms of the New York City Board of Health, before taking office as a United States senator in 1923. ==United States Senate==