He studied at the Royal Conservatory in The Hague with René van Ast, Lidewij Scheifes and Anner Bijlsma. During and after his studies, he specialised in chamber music.

With his baroque group Musica ad Rhenum he has recorded a large number of CDs, which are distinguished by their use of historical tempi and rubato. In recent years, he has delved into classical and romantic styles with groups such as the Van Swieten Society, the Hortus Ensemble and the Archduke Ensemble.

Above all, his interest lies in the use of expressive tools from the early 19th century. In addition to his performing career, Job ter Haar is a research professor at Codarts Rotterdam. In 2019, he completed his doctorate at the Royal Academy of Music in London on the playing style of the 19th-century cello virtuoso Alfredo Piatti.