Does anyone have more info on this Dutch painter "TOON ANTONIUS HENRICUS KOSTER"?

Answer 1

I have been researching him for over an hour and this is what I've found.
I believe that he was Born iin: 1913 - Died in: 1989
Here are some sites and links to your Dutch painter.
All of the following info. is in English;

http://en.wikipedia.org/wiki/Category:Lists_of_painters
http://en.wikipedia.org/wiki/Koster
http://en.wikipedia.org/wiki/Category:Dutch_painters
http://en.wikipedia.org/wiki/Special:Whatlinkshere/List_of_Dutch_painters

Here is a site that has some of his paintings up for auction;
http://www.jacksonsauction.com/Dec05_catalog/catalog/pages/DEC05_DAY1_015.htm
http://www.jacksonsauction.com/Dec05_catalog/catalog/pages/DEC05_DAY1_077.htm

as well as http://web.artprice.com/artistdetails.aspx?idarti=MTY3MDAwMDAxODAyNjQxLQ== This one of the better websites for researching artists.

Answer 2

Here's a little bio, but it's in Dutch:
http://www.galeries.nl/mnkunstenaar.asp?artistnr=29702&vane=1&em=&sessionti=549310838

Apparently, there's a monograph on him, also in Dutch:

Toon Koster, zijn werk & zijn leven. Monografie over de schilder Toon Koster, (1913 - 1989). Meer dan 120 afbeeldingen van zijn schilderijen, tekeningen en gouaches in fullcolour afgedrukt. Geschreven door Theo de With en Harry van Opstal, Noorden 1998.

There seems to be an English web page, but I was not able to open it:
www.netherlands-focus.com/Lore-Netherlands/dutch-painter-toon-koster.html
ISBN 90 70376 18 0