From 2005 to 2014 he served as Secretary General in DanChurchAid – a humanitarian NGO rooted in the Evangelical Lutheran Church in Denmark and also a member organization of the Act Alliance.

[1] Through a diocesan committee, study trips to meet churches in other countries are arranged on a regular basis, and he emphasized building relations with Orthodox migrants of Eastern European background, Persian-speaking migrants, and asylum seekers.

[2] Furthermore, Stubkjær has placed great emphasis on theological education for lay people in the diocese, based on Luther's concept of the priesthood of all believers.

[6] In the summer of 2020 he completed a Master of Public Governance (MPG) degree from Copenhagen Business School.

[7][8][9][10][11][12] In August 2023 Stubkjær was nominated as a candidate for the position of president of the Lutheran World Federation and won the election.