[1] Hazevoet began a career as a professional jazz musician, playing with among others the group For Adolphe Sax led by saxophonist Peter Brötzmann.
[5] In 1970, he formed a quartet with Arjen Gorter, the saxophonist Kris Wanders, and the South African drummer Louis Moholo, and that year they released the album Pleasure.
[1][6] While other pioneers of the Dutch free jazz scene have become well known in the Netherlands and abroad, including Misha Mengelberg, Han Bennink and Willem Breuker, Hazevoet had mostly been forgotten as a musician.
In 2004, this album and Unlawful Noise were reissued by Atavistic Records as part of its "Unheard Music Series", bringing it and Hazevoet himself back into attention.
Henkin compared Hazevoet to the famous American saxophonist Marzette Watts, saying they both "came and went in jazz relatively quickly" and worked with other musicians who had much longer careers.
[2][3] As he later told an interviewer, he "always had a kind of scientific mind and approach to music", and he started a career as a zoologist, studying birds and the fauna of the Atlantic in particular.
In 1986, he first visited Cape Verde, an archipelago nation in the Atlantic, and a few years later began graduate studies at the University of Amsterdam, earning a PhD in 1996.
In addition to ornithology, he is also active in cetology, and coauthored the review article "Whales and Dolphins of the Cape Verde Islands", published in Contributions to Zoology in 2000.