- Krol became a teacher in Weimar, where he set up the school circus "Waldorfschule". He came back to the Netherlands to follow a clown course in Amsterdam.
- Krol became known for his role as the young Bartje in the series of the same name that was broadcast by NCRV from December 1972. He played in the first five of the seven episodes.
- After secondary school, Krol did a youth welfare study in Leeuwarden.
- Krol became involved with the Anders Beleven Foundation (now called: Het Beter Gezelschap), which provides 'sensory stimulation' for health care workers, and with the international theater company Sign Dance Collective, which was founded in 2001. He was active as a freelance actor and clown.
- After his education, he started working in an epilepsy control center and then left for Germany to study.
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