Helen Younger (b. 1949 in Brooklyn, NY, d. 2018 in Pound Ridge, NY). Younger founded Aleph-Bet Books in 1977 and joined the ABAA in 1983. She specialized in children’s and illustrated books. With her spouse Marc and Daniel Hirsch, she authored First Editions of Dr. Seuss Books: A Guide to Identification.
https://www.amazon.com/First-Editions-Seuss-Books-Identification/dp/1892168081