TL;DR
This paper recounts the personal and professional relationship between the author and Leo, highlighting Leo's mathematical achievements and shifts in research interests over several decades.
Contribution
It provides a historical perspective on Leo's career, emphasizing his transition from pure mathematics to applied statistics and their friendship.
Findings
Leo proved the individual ergodic theorem of information theory.
Leo shifted from pure mathematics to applied statistics.
Their friendship grew over decades despite different research paths.
Abstract
I arrived in Berkeley in 1957, at which time Leo was an Acting Assistant Professor of Mathematics here. He had recently proven the "individual ergodic theorem of information theory"---a triumph---and since this was becoming central to my own interests, it would have been natural for us to work together. However, Leo's interests shifted to more applied work, specifically statistics, and he soon moved to UCLA. So we never became collaborators, but we did became good friends, especially after 1980 when he returned to Berkeley as a Professor of Statistics.
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