Many famous scientists are connected by their doctorate advisor-student relations. I wonder if we know which is the largest continuous chain of famous researchers. I have checked pages like academictree.org but tracing back the genealogy can rapidly get you into dead ends. Also sometimes senior academic collaborators are counted as advisor but I wanted to find a genealogy of purely doctorate advisors or equivalent degrees.
Update: https://genealogy.math.ndsu.nodak.edu/extrema.php has some indications of the extrema of their tree but seems mainly focused on mathematics.