(1 February 1922 – 28 October 2012)[1] was a Swiss Prelate of the Roman Catholic Church.
Karlen was born in Törbel, Switzerland, and was ordained a priest on 22 June 1947, for the religious order of the Congregation of Mariannhill Missionaries.
On 26 September 1968 Karlen was appointed bishop of Umtata, South Africa and ordained on 3 December 1968.
He died on 28 October 2012, in the hospital Mater Dei in Bulawayo, aged 90.
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