Matt was born on 23 April 1952 in Mauren as the son of Paul Matt and Gertrud (née Frommelt) as one of four children.[1] He attended the Liechtensteinisches Gymnasium before receiving a doctorate in medicine in 1978; he worked in various hospitals, including in Sierra Leone, before opening his own medical practice in Mauren in 1988.[1][2]
He was a member of the Landtag of Liechtenstein from 1997 to 2001 as a member of the Free List; he was also a member of the Landtag's audit committee.[1] Matt was a co-president of the party from 2005 to 2009, alongside Claudia Heeb-Fleck.[1][3] Following a disappointing result for the Free List in the 2009 elections, Matt and Heeb-Fleck resigned as president and they were succeeded by Wolfgang Marxer in June.[3]
In the run-up to the 2003 Liechtenstein constitutional referendum, Matt alongside other former members of the Landtag, opposed the proposed changes by the prince.[4]
Matt married Ursula Gantenbein on 10 May 1985 and they have four children together. He lives in Mauren.[1]