Pietak studied at the Evangelical Theological Faculty of the Comenius University in Bratislava and at the Christian Theological Academy in Warsaw. He received his doctorate from the Comenius University in 2000. He served as pastor in various congregations, e. g. in Třinec. He was chairperson for catechetics at the Pedagogical Faculty of the University of Ostrava (1993–2003)
He served as the bishop of the Silesian Evangelical Church of Augsburg Confession in 2006–2011.
He is one of the contributors of The Lutheran Study Bible.
- Article The Gospel in Post-Marxist Societies by bishop Piętak
- An open letter from Stanislav Piętak, the bishop of the Silesian Evangelical Church of the Augsburg Confession, to the Southeastern Pennsylvania Synod of the Evangelical Lutheran Church in America (2009)
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