Born in Massachusetts to a family of merchants and seamen, Clapp traveled to Paris to translate the socialist writings of Fourier. In Paris, Clapp abandoned his ardent sympathy for the temperance movement and embraced the leisurely café life of the city. Upon returning to New York in 1850, he sought to recreate this atmosphere, spending hours at Charlie Pfaff's beer cellar, drawing a crowd of journalists, painters, actors, and poets to cultivate an American Bohemia in which participants admired and discussed the work of Edgar Allan Poe, Charles Dickens, and Washington Irving (Martin 15-7).
Charles Pfaff's obituary in the New York Times characterizes him as the proprietor of the famous Bohemian "chop house" at 647 Broadway that flourished between 1860 and 1875 ("In and About the City," 2). Born in Baden, Switzerland likely in 1819, Pfaff first arrived in New York in the early 1850s "part of a wave of German immigrants" (Blalock; Martin 18). According to scholar Justin Martin, "Herr Pfaff was a round little man with shaggy eyebrows and chubby fingers. His Old World manner and thickly accented English gave him a courtly and discreet air" (18).