|Member of the Legislative Assembly of Manitoba|
|Political party||Manitoba New Democratic Party|
The son of Johannes Jennissen and Elizabeth Houben, he was born in Slek-Echt, in the province of Limburg in the Netherlands. His family emigrated to Selnac, Saskatchewan in 1952, where his father worked as a farmer. Jennissen graduated from the University of Saskatchewan in 1966 with degrees in Arts and Education, and received a Master of Arts degree in Communication in 1969. He taught English at Rose Valley High School in Saskatchewan for three years, and worked for Frontier Collegiate Institute from 1972 to 1994. In 1970, he married Lisa Sonnen. He has also been involved in several peace and justice organizations operating in the third world.
In the 1995 election, Jennissen was elected to the Manitoba Legislature for the northern Manitoba constituency of Flin Flon, defeating Progressive Conservative Scott Merrell, 2732 votes to 2017. Also in 1995, he supported Lorne Nystrom's bid to lead the federal New Democratic Party.
He was re-elected by a wider margin in the 1999 election, and received over 73% support in the 2003 election. Jennissen was the NDP critic for Highways and Transportation between 1995 and 1999, but was not appointed to cabinet when the NDP formed government in 1999.
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- "Flin Flon". Manitoba Votes 2007. CBC News.
- "New appointments announced to Manitoba Hydro Board". Government of Manitoba. February 28, 2000.
- "Cross Canada Support for Bill". Bill Blaikie, Elmwood—Transcona. Archived from the original on April 1, 2007. Retrieved June 29, 2012.