In between, doing team with José Luis Sánchez Palacio for the Linear Geometry subject, I had Gerald Welters as a Professor. I had liked very much Canela and Tort, but Welters was hugely impressive. I've never liked any other as much as him. But this is a very personal impression. Most of mine colleagues —his students— didn't like him at all (and have a long time very bad memory), while a few liked him very much (and have a long time very good memory). There are almost no places in between. He is now retired too, and he was a great mathematician in a subarea of Algebraic Geometry. Descendent of many big mathematicians (https://www.mathgenealogy.org/id.php?id=49936), he published in the Annals of Mathematics (https://annals.math.princeton.edu/1984/120-3/p03), probably the most important journal of mathematics through the last decades. And he suggested a quite relevant conjecture, whose proof was also published in the Annals of Mathematics (https://annals.math.princeton.edu/2010/172-1/p09).

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