Theo Damsteegt's printmaking focuses especially on linocut, offset prints, and drypoint etching.
He is also active in fine art photography.

He has had several exhibitions in the Netherlands and abroad, and has been active as coordinator of the exhibitions committee of an artists' group in The Hague called KunstPost Mariahoeve.
At present, he is secretary of the artists' collective "ArteryKC", which also has its basis at The Hague, member of the Voorschotense Kunstkring, and member of the editorial board of the Dutch printmakers' magazine Raam.