Abstract
This essay highlights some special strengths of Jean Gayon’s approach to theGayon, Jeanon the history of French genetics history of French geneticsFrench geneticsbyGeneticshistory of French genetics providing a partial account of our collaboration. I begin with our first meeting and the work it initiated. I then illustrate key aspects of Jean’s approach to understanding complex histories involving conceptual conflict and conceptual change like those we encountered in our studies of theGayon, Jeanon the history of French genetics history of French geneticsFrench genetics. InGeneticshistory of French genetics my view, Gayon’s great skill in teasing out conceptual connections and analyzing conceptual revisions has sharpened our thinking on topics far beyond those on which any one of us has worked on. Today, his exemplary efforts to explore an enormous range of topics in both breadth and depth provide a model of the role of a scholar, or of a historian-philosopher.