He was born on April 28, 1910, in Plainfield, New Jersey, to Samuel Merwin Sr.[1] He received a BA from Princeton in 1931 and studied at the Boston Museum School of Fine Arts.
He began his career in mainstream journalism - as a reporter for the Boston Evening America (1932–1933) then as the New York City Bureau chief for The Philadelphia Inquirer.
[2] Merwin quit his editing job in 1951 to become a freelance writer, but his mysteries and science fiction books were only moderately successful, either commercially or critically.
Three of his detective stories had as an investigator Amy Brewster "a cigar-smoking, 300-pound lawyer-financier...Upper class but unfeminine" who solved mysteries for her friends.
[6] P. Schuyler Miller praised the novel as "roundly entertaining [and] firmly plotted [and] fully packed with all sorts of neat little bits of color and detail.