Education
He graduated Akademia Górniczo-Hutnicza im. Stanisława Staszica University of Science and Technology and Nicolaus Copernicus University in Toruń.
He graduated Akademia Górniczo-Hutnicza im. Stanisława Staszica University of Science and Technology and Nicolaus Copernicus University in Toruń.
He worked as geodesist. Since 1987 he worked in Bydgoszcz Voivodeship Office. Between 1998 and 2001 he was a Vice-Starosta of Bydgoszcz County (Polish: wicestarosta powiatu bydgoskiego).
After appointed of Leszek Miller Cabinet, Kosieniak was nominated as Voivode of Kuyavian-Pomeranian Voivodeship (wojewoda kujawsko-pomorski).
He was a Voivode between 20 October 2001 and 26 January 2006.