Jack Vallentyne's character, vision and accomplishments are well memorialized in his published opus, institutional structures he helped create, the memories of children and others who knew him as Johnny Biosphere and in the recollections of his students and colleagues published in this issue and elsewhere. I met him when I came to Cornell in August 1961 as a graduate student in its Department of Zoology. I never took a course with Jack or collaborated on a research project with him or saw him more than three to four times after we both left Cornell in August 1966. Yet he exerted multiple positive influences on my own professional life. I offer a few recollections of our personal interactions and brief accounts of his influence on early diffusion of the trophic cascade concept and the teaching of physical limnology.

On arrival at Cornell I was assigned, with Roger Green, a large office...

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