In 1725 he moved back to southern Norway where he was appointed vicar in Avaldsnes He was appointed vicar in Alta in Finnmark during 1728. Dating from 1752, Leem headed the Seminarium Lapponicum Fredericianum in Trondheim until his death in 1774.
Leem relocated to southern Norway in 1725 and took up the position of vicar at Avaldsnes. Two years later, he was appointed vicar at Alta in Finnmark. He served as the head of the Seminarium Lapponicum Fredericianum in Trondheim from 1752 until his passing in 1774.