He served in the Legislative Assembly of Manitoba as a Progressive Conservative from 1959 to 1962 and was a cabinet minister in the government of Dufferin Roblin.
[3] He worked as an automobile and implement agent, and was the president of Christianson Ltd. and Koko Platz Development Ltd. From 1942 to 1945, he served as a pilot in the Royal Canadian Air Force.
[1] Christianson's time in office was brief, as he narrowly lost his seat to Liberal candidate Gordon Johnston in the 1962 election.
Some believe Christianson lost his riding because of local opposition to the Portage Diversion flood relief project.
After his retirement, he became co-founder and vice-chair of Canadian International College, an English language university for Japanese students.