He was born in Zurich and was first the pupil of his father Johann Keller, a sculptor. He moved to The Hague and became the teacher of
Dirk van der Aa and
Cornelis Kuipers. He is known for his wall decorations and in 1751 he worked in The Hague on wall decorations for a mansion on the
Lange Voorhout, now called the
Escher Museum. In 1753 he made wall decorations for what is now
Het Loo Palace. He died in The Hague. ==References==