John Raymond Kavanagh, an Irish martial arts coach, whose students include fighters such as Conor McGregor and Gunnar Nelson, an Icelandic mixed martial artist currently competing in the Welterweight division of what championship?
John Kavanagh (martial artist): John Raymond Kavanagh (born January 18, 1977) is an Irish martial arts coach, brazilian jiu-jitsu practitioner and former professional mixed martial artist. John Kavanagh (martial artist):  His students include fighters such as Conor McGregor and Gunnar Nelson. Gunnar Nelson (fighter): Gunnar Lúðvík Nelson (born 28 July 1988) is an Icelandic mixed martial artist currently competing in the Welterweight division of the Ultimate Fighting Championship.
the Ultimate Fighting Championship