He was educated at Kilkenny College and at Saint Columba"s College, Dublin. Chamney runs for the Crusaders Air Corps club whilst in Dublin and has been on an athletics scholarship at the University of Notre Dame, South Bend, Indiana where he studied English from 2002–2007.
He specialises in the 800 metres event. In 2006, Chamney earned All-America honours at the National Collegiate Athletic Association Indoor Championships, picking up his first career citation with a sixth-place finish in the 800-metre run at the Randall Tyson Track Center in Fayetteville, Arkansas. Chamney repeated his performance that spring at the National Collegiate Athletic Association Outdoor Championships in Sacramento, California, again finishing sixth and picking up All-America honours.
This winter, Chamney became a three-time All-American with his performance in the National Collegiate Athletic Association Indoor Championships.
In international competition, Chamney has represented Ireland in the 800 metres at the European Athletics Championship in 2006 and at the European Indoor Championship in 2007. If he remains injury free it is likely that he will break the Irish Indoor record for 800m in the next year or two.
Chamney developed a cult following on the Internet amongst both track fans and non-fans when he began posting training journals on the college track and field site TrackShark.com. An English major at the University of Notre Dame, Chamney was able to use his literary talents and his personality to build a loyal fanbase of American readers who embraced the aggressively cocky yet often self-deprecating sense of humour which "the Chamdawg" possessed.
Chamney"s entries were generally quite a lengthy fictionalised version of events written in an Irish vernacular, drawing inspiration from a similar column in Dublin"s Sunday Tribune.
Chamney"s last journal entry was written on 23 February 2006. In a 2007 interview with TrackShark.com, Chamney stated that he enjoyed writing because of the positive feedback and widespread praise that it drew from his fans. However, he discontinued the journals because he felt slighted by some of his Irish countrymen who accused him of exploiting the literary styles of some notable Irish columnists.
Having graduated the University of Notre Dame in May 2007, Chamney trained briefly in Soria, Spain with renowned coach Enrique Pascual before moving to Tallahassee, Florida to prepare for the 2008 Beijing Olympics.
His Olympic year was documented in his online blog, web.mac.com/madra08. At those Olympics Games, he placed 5th in his heat in a time of 1:47.66 and failed to progress to the semi-finals.
After the Beijing Olympics Chamney moved to live and train in Limerick, Ireland where he currently resides. He has competed, since those Beijing Games, at the 2009 World Athletics Championships in Berlin over the 800m and the 1500m as well as the 2010 European Championships in Barcelona over 1500m.
At both those competitions he failed to qualify for the final.
He has lowered his personal bests to 1:45.41 (Bislett Games, Oslo, 2009) and 3:36.83 (Meeting Ciutat de Barcelona, 2010).
He is a four-time Irish Senior 800m champion and competed at the Beijing Olympics in that event in 2008. Chamney is a former Irish U23 800m champion and was 5th in the 2005 European U23 Championship when he recorded a personal best time of 1:46.82. In somewhat controversial circumstances Chamney was selected for those Olympics Games having only attained the B standard for the 800m when he ran 1:46.66 at a meeting in Lignano, Italy.
