Yoo's Ph.D. dissertation is titled "Entry Into a Foreign Market: Theory and Evidence" and was supervised under Rachel McCulloch.

[9] Yoo also served as Chief of Staff to future President and then-lawmaker/Chairman of the Hannara Party Park Geun-hye in 2005.

Yoo was the floor leader for the Saenuri Party (renamed from Hannara) in the National Assembly, resigning from the position in July 2015.

[9] Following greater separation from Park in 2007, as well as his open critical comments of President Park's policies such as opposing the President's promise to expand welfare without increasing taxes, Yoo was deselected from his party's nomination process in for the 2016 general election.

[citation needed] Yoo finished fourth in the election, with his best results in his home area of Daegu.

[citation needed] He is considered one of the leading politicians who advocate moderate conservative factors.

In a lecture at Sungkyunkwan University on the theme of "economic crisis and the role of politics," Yoo said a "conservative revolution" aimed at warm, just conservatism based on Republican ideology is needed in an era of despair.

It also stressed aspects of public interests that the state and its citizens should pursue, saying that "the most important value in the republic is justice.