He also attended the Royal Danish Academy of Fine Arts where he was influenced by Gustav Friedrich Hetsch.
Christian VIII charged him with executing all Danish medals with title of royal court and order jeweller (kgl.
He collaborated with artists such as Arnold Krog, Harald Slott-Møller, Hans Tegner, Martin Nyrop and especially Thorvald Bindesbøll.
The artists that he collaborated with included Svend Hammershøi, Ib Lunding, Olaf Stæhr-Nielsen, Palle Suenson and Arne Bang.
Poul Ulrich Michelsen was appointed to Commander of the Order of the Dannebrog in connection with the one hundred years' anniversary of the company in 1941 and the Danish Museum of Arts and Crafts arranged a retrospective exhibition.
The company later established a factory at Sturlasgade 14 in Islands Brygge while its shop was situated at Bredgade 11.