Bosker is the son of parents with a skating career. His mother Henriët Bosker-van der Meer was Dutch all-round champion in 1989. Father Ronald Bosker also participated in the Dutch championships and finished seventh that same year. After immigrating to Switzerland, both his parents represented Switzerland during the 2003/2004 seasononwards. Bosker was born in Switzerland. At the age of 14 he moved to the Netherlands without his parents and stayed with a host family so that he could develop his potential in speed skating.
Records
Personal records
At the end of the 2020–2021 speed skating season Bosker occupied the 18th position on the adelskalender with a score of 146.948points