Bob Bjornerud was born in Kelvington and was raised in Saltcoats. He began his career in mining with International Minerals and Chemicals in Esterhazy. Following this, Bob went into farming. 

At the local level, Bob served as a councillor in the rural municipality of Saltcoats for seven years and then as reeve of the R.M. for another seven years. 

Bob was first elected to the legislature in 1995 to represent the Saltcoats constituency (now the Melville-Saltcoats constituency) as a member of the Liberal Party of Saskatchewan. As one of the founding members of the Saskatchewan Party, Bob served as the critic for Agriculture, Municipal Affairs, and also as the Opposition Whip. He was re-elected in 1999, 2003, 2007, and 2011. 

Since 2007, Bob has served as the Minister of Agriculture. 

Bob has three children and six grandchildren. He resides east of Yorkton with his partner Joan.