He was born at Aggersbøl in
Vejle County, Denmark. He started his education at the
Copenhagen Technical College from which he left in 1895. In the same year, he was admitted to the
Royal Danish Academy of Fine Arts. He worked for various architectural and design firms including for
Vilhelm Dahlerup in 1893–94, Gotfred Tvede in 1894-96 and
Fritz Koch in 1896-1905 and at times at Caspar Leuning Borch. He had an independent architectural firm in Copenhagen in 1905, from 1919 with Jørgen V. Jepsen as a partner. He often appeared at the
Charlottenborg Spring Exhibition. Ingwersen graduated from the
Danish Art Academy in 1906. In 1917 he assisted Jens Christian Rantzau in a renovation of
Krengerup manor on
Funen. He was later made a
Knight of the Dannebrog for his services to Danish architecture.{{cite web|url= https://www.kulturarv.dk/kid/VisWeilbach.do?kunstnerId=7476&wsektion=biografi ==References==