Howard Atwood Kelly,
American Medical Biographies
(1920)
“ Hospitality, money, kindly assistance of various sorts, were always to be had by fellow ophthalmologists from the gruff, short-spoken, but tender-hearted Knapp. Who can estimate the value of this man's services to the poor of greater New York—services given with a kind of joyous enthusiasm for more than forty years, wholly without money and without price? And who can appraise those still more enthusiastic and even more inestimable services which Knapp for so long rendered as a teacher of teachers, a shaper and developer of operators and writers? ”
