He came to wide prominence following the condemnation that UEFA suffered in the wake of the 2007 Champions League Final.
Before UEFA 
His role within UEFA 
William Gaillard is the Senior Adviser to the UEFA President Michel Platini as well as the UEFA's Director of Communication and Public Affairs. He advises the UEFA President on political issues and oversees all external communications
Gaillard heads UEFA's Communications and Public Affairs Division, which is responsible for all activities involving UEFA's relations with the media, as well as for the production of UEFA's various publications and reports and the UEFA charity portfolio.
William Gaillard has been highly visible since joining UEFA; indeed, he is perhaps the most prominent of UEFA's senior officials, along with President Michel Platini.
Gaillard has been highly active in anti-racism work within football. Following England's game in 2004 against Spain when players were subjected to racial abuse, he stated that players should not leave the pitch:
|“||We would not condone such behaviour for the very simple reason it could lead to all sorts of abuse," he said. "I don't think we should advise this kind of behaviour for merely technical reasons, because we would have hundreds of cases in which players could walk off the pitch and say 'I heard someone shouting something'. "I don't think this is the right attitude.||”|
—William Gaillard, 
2007 Champions League Final 
At the 2007 UEFA Champions League Final trouble occurred after thousands of ticketless Liverpool supporters stormed the turnstiles, meaning some 2000 fans with genuine tickets were denied entry. Gaillard said that the problems in Greece were typical of the behaviour of some Liverpool supporters during the past four years, branding them the worst in Europe; despite earlier saying that both sets of supporters 'have a tradition of good behaviour'. He accused Liverpool supporters of stealing tickets "out of the hands of children" and said "we know what happened in Athens and Liverpool fans were the cause of most of the trouble there". This was seen by some as UEFA attempting to avoid the blame for the disorganisation of the final, and they were accused by Richard Caborn as entering into the blame game. This also resulted in Gaillard being heavily criticised by Liverpool co-owner Tom Hicks.
See also 
- "William Gaillard". European Communication Summit. 2007. Archived from the original on 2008-05-13. Retrieved 2008-09-16.
- "UEFA - Introduction: Marketing & Media". UEFA.com. 2007-05-22. Archived from the original on 2007-06-03. Retrieved 2007-06-05.
- "Taylor wanted England to walk off". BBC.com. 2004-11-18. Retrieved 2008-09-13.
- "Galliard: denial exists over racism". Kickitout.org. 2005-05-19. Retrieved 2008-09-16.
- "Camp Nou takes centre stage". Uefa.com. 2006-01-20. Archived from the original on 2008-05-07. Retrieved 2008-09-16.
- Praverman, Frank (2007-06-04). "Liverpool fans are worst in Europe". London: www.timesonline.co.uk. Retrieved 2008-09-16.
- Bond, David (2007-05-23). "Greek police put on 'full alert'". London: Daily Telegraph. Retrieved 2007-06-08.
- Liverpool are 'the worst fans in Europe' says Uefa report
- "Caborn and Parry hit back at Uefa". BBC. 2007-06-04. Retrieved 2007-06-05.
- "Soccernet". ESPN. 2007-05-24. Retrieved 2007-05-28.
- "Caborn & Platini hold Reds talks". BBC. 2007-06-05. Retrieved 2007-06-05.
- "Platini Says Liverpool Fans Not Worst". 442. 2007-06-06. Retrieved 2008-09-16.