Prior to his campaign for and subsequent appointment to the Illinois Senate, McConchie served as vice president for Americans United for Life.

[7] McConchie is the senior advisor for the Public Sector division at The Shelby Group,[8] a company that works to optimize procurement operations.

[10] He defeated two other candidates[11] in the March 15, 2016 primary election,[3][12] winning 36.6% of the vote to opponent Casey Urlacher's 32.8% and Martin McLaughlin's 30.6%.

[13] In April 2016, McConchie was subsequently appointed to the district after Duffy chose to retire early,[4][14] and he opened his Senate office on July 27, 2016.

[25] In 2016, McConchie sponsored a bill signed into law that expanded voting rights in party primaries for 17-year-olds who would turn 18 by the date of the general election.

McConchie lives in Hawthorn Woods, Illinois with his wife and two children[29] and is a member of Heritage Church in Lake Zurich.