[3] It is assumed that he operated a big workshop with a large output to supply the export market.
[citation needed] The painter was virtually unknown until the discovery in the early 1990s of a painting bearing his full signature.
Numerous attribution issues had to be dealt with as Willemsens was not the only contemporary painter who used the monogram AW.
The monogrammist AW who was responsible for a number of oil on copper paintings held by the Prado Museum has now been conclusively identified as Adriaen Willemhoudt.
[3] In addition to copies after Rubens, Willemsens painted landscapes on copper, often animated with religious or genre scenes.
His figures were derived primarily from paintings by Rubens, Hendrick van Balen and Gerard Seghers.