Imboden joined the Fencer's Club in Manhattan, where he first met Jed Dupree and Dan Kellner, both of whom were foil fencing Olympians at the 2004 Summer Olympics.

One lasting connection was that of the friendship to his long-time colleague Declan MacPherson, who Imboden notably gave an autograph to upon their first meeting.

[5] After graduating high school in spring 2011 he reconsidered his earlier signed intent to immediately attend Notre Dame, and took a year to focus on his training.

[2] Imboden and French foil fencer Ysaora Thibus met at a party after the Rio de Janeiro Olympic Games and began dating shortly afterward.

For his first participation to an event of this magnitude, he reached the quarter-finals after seeing off triple world titlist Peter Joppich, but lost to France's Victor Sintès.

In June of the same year he won a silver medal in the Pan American fencing Championships in Cartagena after being defeated in the final by his teammate Gerek Meinhardt.

At the 2013 World Fencing Championships in Budapest Imboden was defeated in the table of 16 by Ukraine's Rostyslav Hertsyk, who later earned a bronze medal.

[15] The 2015 World Championships in Moscow proved a disappointment: Imboden was defeated in the table of 16 by Olympic champion Lei Sheng.

[17] In the 2015–16 season Imboden achieved another double-gold haul at the Paris World Cup, becoming the first fencer since Benjamin Kleibrink in 2006–2007 to win back-to-back editions.

[19] At the 2019 Pan American Games in Lima, Peru, Imboden and teammates Gerek Meinhardt and Nick Itkin won gold medals for the US men's foil team.

Following the U.S. men's foil team victory at the 2019 Pan American Games in Lima, Peru, which earned Imboden and teammates Gerek Meinhardt and Nick Itkin gold medals, Imboden knelt on one knee on the medal podium as the United States national anthem played.

[20] He stated in a post on Twitter that he had done so as a protest against racism, for gun control, mistreatment of immigrants, and the rhetoric of President Donald Trump.

This week I am honored to represent Team USA at the Pan Am Games, taking home Gold and Bronze.

I chose to sacrifie [sic: read sacrifice] my moment today at the top of the podium to call attention to issues that I believe need to be addressed.

I encourage others to please use your platforms for empowerment and change.On 21 August 2019, Imboden was placed on a twelve-month probation by the U.S. Olympic and Paralympic Committee for his protest at the Pan American Games.