The son of Charles H. and Julia P. Walker, Charles Alvah Walker married Mary E Walker, who was also from New Hampshire.
A painter, etcher and engraver, he was a member of the Boston Art Club, the London Print Sellers Association, and the Copley Society. He
He is said to have invented the term 'monotype' around 1880 and together with Whistler's friend Otto Henry Bacher (1856-1909) and William Merritt Chase (1849-1916) and others, established a 'Monotype Club' in New York in the 1880s.
He also advised several major collectors in building up their collections. He probably owned Study of a Head y427 in 1898.
US birth and census (1860, 1910, 1920) records, Ancestry.com.
Moser, Joann, Singular Impressions: The Monotype in America, Smithsonian, Washington DC 1997. 'Charles Alvah Walker', American Art News, Vol. 18, No. 26 (17 April 1920), p. 4 in jstor. 'Charles Alva Walker', White Mountain Art & Artists, website.