[8] As a missionary of the Northern Evangelical Lutheran Church, Krogh was one of the Editors[9] of the weekly,[10] Pera Hoor published since 1922 in Santali language.
[11] Krogh first came to India in 1947[6] as a Missionary of the Danish Lutheran Church and was Rector of the Kaerabani[12] Santal High School[13] in Benagaria, now under Dumka District in Jharkhand.
During 1948[17]-1953,[6] Krogh was Missionary in Gauranga, Kokrajhar district, as well as Bongaigaon[16][18] in Assam and returned in academics when he went back to Jharkhand to take up the Principalship of the Santal Theological College.
From 1972[12] onwards, Krogh was made Associate Registrar[6] of the Senate of Serampore College (University) where he worked[19] along with C. Devasahayam, then Registrar and in the ensuing years, Krogh was made full charge of the Registrarship as C. Devasahayam went on leave from 1975 to 1978[12] as Pastor of the Lower Circular Road Baptist Chapel founded by William Carey (missionary) in Kolkata.
On Krogh's departure from India in 1978, the Senate of Serampore College (University) conferred an honorary Doctor of Divinity degree by honoris causa.