In January of 2006, he became the Press Officer of Pro-Test, giving interviews to the [[BBC]], Sky and [[Fox News]]. During 2007, Mr. Holder took over the communications and internal operations in addition to his role as press officer.
In March of 2008, he moved to the United States to found Speaking of Research and "take on animal rights groups". According to its website, its "grassroots activities" on campuses are aimed at "generating student and faculty support" for [[animal testing]]. In October of 2008, he returned to the UK. He is a regular contributor to the groups' blog and travels around the world to give talks on behalf of both Speaking of Research and Pro-Test. This project was funded by Pro-test and the [[Americans for Medical Progress]] (AMP), currently operating on a small budget met by individual contributors.<ref>[http://speakingofresearch.com/about/founder-biography/ "Founder Biography"], Speaking of Research, accessed February 2010.</ref><ref>[http://www.amprogress.org/MichaelHayreFellowship Micheal D. Hare Fellowship in Public Outreach], [[Americans for Medical Progress]], accessed February 2010.</ref>Holder no longer assists Pro-Test.
===Pro-Test===