A referee from a small country like Luxembourg will never get enough experience to be in charge of a Champions League match, or even become a FIFA badge holder. But Hamer got the chance to officiate matches in Belgium (a somewhat bigger country than Luxembourg) and especially in the French Ligue 1.
Hamer had a long and impressive career. He was a UEFA Elite Category referee and retired at 45 at the end of 2010.
Although he was on the long list and he has a lot of experience, Alain Hamer was not one of the referees in Germany 2006. Still he has seen his share of World Championships: the one for women in 1995 (Sweden).
Other tournaments Hamer participated in were Euro U21 1998 (Romania), World Youth Championship 2001 (Argentina), 4th Official in Euro 2004 (Portugal), African Cup 2004 (Tunisia) and World Cup U17 2005 (Peru).
In the 14 years he has been a FIFA referee Alain Hamer slowly worked his way towards the top ten of the referees who have officiated the most Champions League matches. There is a list on the RSSSF site. On that list Hamer is number 12.
fouls and cards
Alain Hamer has an exceptionally high card average and is known to whistle a lot, sometimes every 1.5 minutes. (see palmares and did-you-know section)