"I do have to share the credits for my silver penny"
Arnold Heemink (Mathematical Physics) is humble when he talks about his silver penny that he received in honor of the promotion of his 50th PhD candidate.
Arnold: "On the top shelf of my book cabinet you can see them all, all 50 theses. I can't pick one that stands out. I do value the researches with whom I have worked with for one or two decades, even after their promotion. Actually, I prefer this past of my job the most: you can guide young people in a certain direction, it forms young scientists. However, i do have to share the credits for my silver penny. I had a role in the background in about 50% of the researches. That is why I am very happy with the upcoming changes in science, that PhD candidates can officially promote at associate professors too in the future."