[1][2] He first appears around 1664 in Stockholm (possibly coming from Germany), when he entered service with count Magnus Gabriel De la Gardie, the Lord High Chancellor of Sweden, who was his main employer and patron until around 1668.
Possibly due to metal fatigue caused by the softness of the material, however, few of Dieussart's works survive.
[8] Probably assisted by his stepsons he created several sculptures to decorate the gardens and fountains of Jakobsdal (now Ulriksdal) Palace.
[5][9] In 1667 he was contracted by De la Gardie to create a number of lead sculptures for the roof of the Riddarhuset (which was completed by the architect Jean de la Vallée between 1660 and 1674),[10][11] which he delivered in 1668,[1] and he was commissioned to complete the northern and southern portals of the building that had been begun by Heinrich Lichtenberg [sv], which he was still working on in 1669.
[1] His stepson Abraham-César replaced him as sculptor in De la Gardie's service between 1671 and 1672 and Dieussart is believed to have stayed in Sweden until around 1672, probably employed in his stepson's workshop,[1] but then may have moved back to the Netherlands, appearing again in Swedish records in 1677,[b] and returning to the Swedish mainland around 1679, probably returning to De la Gardie's service.