With the death of Sidney Holt late last year, the world lost a man blessed with a towering intellect, boundless curiosity and an unwavering commitment to conservation. Sidney began his professional life in 1947 at the Fisheries Laboratory in Lowestoft, UK. Michael Graham was the lab’s director then and he set Sidney on the path that led, a decade later, to the publication of what is often called the Bible of fisheries science and which he co-authored with Ray Beverton. Titled On the Dynamics of Exploited Fish Populations, that seminal work, frequently described as the most-cited reference in fisheries science, continues to underpin fisheries management to this day. Not bad for a first effort!