Following high school, Guernsey attended College of the Ozarks near Branson, Missouri, graduating with a Bachelor of Science degree in Business Administration in 2003.
Guernsey represented the 3rd (but now represents the 2nd. See below) District, encompassing all or portions of Daviess, Gentry, Grundy, Harrison, Mercer, Sullivan, and Worth counties in northcentral Missouri. Due to Missouri House redistricting following the 2010 United States. Census, much of the current 3rd District was renamed the 2nd District effective January, 2013.
The new boundaries include all of Daviess, DeKalb, Gentry, and Harrison counties, but no longer all or parts of Grundy, Mercer, Sullivan, or Worth counties.
On January 31, 2014 Guernsey announced he would not be a candidate for re-election in the 2014 Missouri House races nor would he be running for any seat in the Missouri Senate. Casey Lee Guernsey was born October 14, 1980 in the medical facilities at the United States Air Force Academy near Colorado Springs, Colorado.
He is a 1999 graduate of South Harrison R-II High School in Bethany, Missouri. Representative Guernsey is a 7th generation family farmer and actively involved in the family dairy and beef production when not busy in the state legislature.
Previously Guernsey served as a staff policy analyst for United States.Congressmen Roy Blunt and Sam Graves in Washington, District of Columbia
Representative Guernsey has a family history of political involvement. His ancestors include Senator Charles A. Guernsey and Richard Gentry, a former Missouri state Senator killed while leading troops at the Battle of Lake Okeechobee during the Seminole Wars. Casey Guernsey first ran for State Representative in 2006, losing to incumbent Jim Whorton.
Whorton was term-limited under Missouri law from seeking reelection in 2008.
Guernsey ran unopposed in 2010. In November, 2012 Guernsey ran for the newly created 2nd District seat, defeating Independent candidate Jim Nash to earn a third term in the Missouri House.
Representative Guernsey serves on the following committees:
Chair, Agribusiness. Appropriations - Agriculture and Natural Resources subcommittee.
Budget. Rules. Special Standing Committee on Renewable Energy.
On January 31, 2014 Representative Guernsey announced he would not be seeking re-election for a final two-year term from the 2nd District, as allowed under Missouri term limits. Neither, said Guernsey, would he be a candidate for the 12th District Missouri Senate seat being vacated by term-limited Republican Brad Lager, even after loaning his campaign committee $100,000 to run for the vacated Senate seat and clearing the primary field of opposition. Guernsey cited a desire to take a different direction in his life and the large time spent away from home serving his constituents as reasons for his decision.
He did not rule out the possibility of running for elected office in the future, however, and vowed to stay active in Missouri Republican politics.
He is a member of the Blue Ridge Christian Union Church as well as active with the National Rifle Association, Farm Bureau, National Federation of Independent Business (NFIB), and Rotary International.