William Yarrell was a zoologist. He was one of the original members of the Zoological Society of London and was a founder of the Royal Entomological Society. He was ZSL Secretary from 1836-1838.
William Ogilby was a zoologist. He is perhaps best known for this work around the classification order of cheiropoda, linking mammals who had hands. He was ZSL Secretary from 1839-1847.
William Lutley Sclater was a zoologist and the son of previous ZSL Secretary, Philip Lutley Sclater. He himself was only ZSL Secretary for 1 year in 1903, before Peter Chalmers Mitchell was selected for the post.
Philip Lutley Sclater was an English zoologist and lawyer. He is best known for his work on ornithology. He was the longest serving ZSL Secretary, for 42 years between 1859-1902. In this time he corresponded with countless people around the world, and these letters are the ones that are extant.
Peter Chalmers Mitchell was a Scottish zoologist, and ZSL Secretary from 1903-1935. He was responsible for founding Whipsnade Zoo.
Nicholas Alyward Vigors was an Irish zoologist and politician and one of the founding members of the Zoological Society of London. He was the 1st secretary of the society, and was in post from 1826-1833.
Julian Sorell Huxley was an English evolutionary biologist, eugenicist and internationalist. He was ZSL Secretary from 1935-1942, in which time he introduced Pet's corner (the children's zoo) and Zoo Magazine.
John Barlow was was an Anglican priest. He was ZSL Secretary from 1837-1838, after which he spent many years at the Royal Institution.