Pinsent began at Eton with the rowing. He was the 1990 rowing partner of Steven Redgrave in the coxless pairs. This was the beginning of a long and successful partnership. Together they won the 1991 World Rowing Championships in Vienna, at the 1992 Olympic Games in Barcelona and at the 1996 Olympic Games in Atlanta. Four years later, at the Olympic Games in Sydney, Redgrave Pinsent and won along with James Cracknell and Tim Foster in the coxless four.
After Redgrave Pinsent and Cracknell resignation formed a new team in the coxless pairs and in pairs with coxswain ( with Neil Chugani driving). At the 2001 World Championships in Lucerne, he won two without and " two with " within just 2 hours. At the 2002 World Championships in Seville he won the two without. At the 2003 World Championships in Milan Pinsent was beaten for the first time since 1991. For this reason he joined the coxless four. At the 2004 Olympic Games in Athens Pinsent won in four without, along with James Cracknell, Ed Coode and Steve Williams. From 2001 to 2004 he was a member of the IOC. In late November 2004, he announced his resignation.
In 1993 Pinsent was honored by Queen Elizabeth II as a Member of the Order of the British Empire ( MBE), appointed in 2000 Commander of the Order of the British Empire ( CBE) in 2004 and finally as a Knight Bachelor in the ennobled. In the same year he won the International Rowing Federation FISA with the Thomas Keller Medal, the highest honor in rowing. It was presented to him in May 2005 in Eton.
Today, Sir Matthew Pinsent involved with Sir Steven Redgrave in fundraising initiatives for charitable purposes, particularly in the field of youth work and diabetes prevention.