 Hickling became a noted expert on Lehmann's career and work, compiling a Lehmann discography in 1987.He continued to compile and collect material and memorabilia relating to her career, which now forms a significant part of the Lotte Lehmann Archive in Santa Barbara.The foundation's precursor, the Lotte Lehmann League, published a newsletter from 1989 to 1994; the league was later re-established as a website in 2011.