Theo Niermyer is born in Amsterdam on the 21st of April 1940. He studied at the 'Kunstnijverheidsschool' in Amsterdam and at the academy's of Warschau and Antwerp.
Niermeijer is a painter, sculptor (metal constructions) and also an architect. Member of the 'Liga nieuwe beelden', the 'Kring van Beeldhouwers', and the 'Beroepsvereniging Beeldende Kunstenaars (B.B.K.)'.