PeacePlayers International works in Northern Ireland, using basketball to promote healing between groups with long-standing conflicts.
So what's like to suddenly be thrust in to the spotlight by the royal couple? Brendan Tuohey, the group's co-founder and executive director, says they're thrilled.
"It's just a great opportunity to publicize PeacePlayer's work, particularly in Northern Ireland. But to have Prince William and Ms. Middleton make this effort part of their wedding and to have PeacePlayer's Northern Ireland included is really just a great honor for our organization," he says.
Touhey says they've been working in Northern Ireland for more than eight years and have brought together 10,000 young people from Protestant and Catholic communities.
"Kids are coming together, relationships are being developed. We've created new leaders who are delivering the program in their communities and we've been able to work with a lot of big partners as well to use what we learned to help out other organizations that use sports to bring kids together," he says.
PeacePlayers is the only U.S.-based charity selected by the royal couple.