A snappy dresser who earns the nickname “the yellow rose of Finglas,” Tunney is sometimes seen as pompous, a perception possibly attributable to his acting background, which once leads to an audition at Dublin’s Abbey Theatre.
In 1963 Tunney joins Fianna Fáil, and stands for the party at the 1965 Irish general election but is not elected. He is elected to Dáil Éireann as a Fianna Fáil TD for the Dublin North-West constituency at the 1969 Irish general election. He serves continuously in the Dáil until losing his seat at the 1992 Irish general election, having been a TD for Dublin Finglas from 1977 to 1981 when Dublin constituencies are reconfigured as 3-seaters, before being returned for Dublin North-West in 1981.
During this period Tunney serves as Parliamentary Secretary to the Minister for Education (after 1978, Minister of State at the Department of Education) in three governments. He serves as Leas-Ceann Comhairle of Dáil Éireann from 1981 to 1982, and from 1987 to 1993. He is also chair of the Fianna Fáil parliamentary party for ten years. He is a member of Dublin City Council, and serves as Lord Mayor of Dublin from 1984 to 1985.
Following Tunney’s death, TaoiseachBertie Ahern describes him as “a parliamentarian and a gentleman who was passionately committed to serving his country.” Ahern adds, “he was not only a man of substance but one of style. From the flower that was always in his buttonhole to the elegance of his language in both Irish and English he had a commanding and stylish presence.”
Fine Gael leader Michael Noonan says Tunney had gained “the widespread affection and respect of colleagues of all political parties.”
Leader of the Labour PartyRuairi Quinn describes Tunney as a “thoughtful and courteous colleague” who carried out his duties with “fairness but also with wit and style.”
Before entering politics, Cannon is a planning official for Galway City Council and Dublin City Council, as well as CEO and secretary of the Irish Pilgrimage Trust. In 2002, he is honoured as one of the Galway People of the Year.
Cannon is elected as Leader of the Progressive Democrats in April 2008. He is the first leader of the party to sit as a Senator while serving as leader. At his first press conference as party leader, he states that he believes “there was passion, commitment, talent and knowledge within the PDs’ ranks to stage a big comeback.”
However, after speculation increases that Noel Grealish, one of the two Progressive Democrat TDs, intends to leave the party, Cannon announces in September 2008 that a party conference will be held on November 8, 2008, at which he will recommend that the party disband. The delegates present at the conference vote 201–161 to agree with this recommendation.
On March 24, 2009, Cannon announces his decision to resign the leadership of the Progressive Democrats and joins Fine Gael the same day. At the 2011 Irish general election, he is one of two Fine Gael TDs elected in Galway East.
In 2019, in recognition of his work in education, Cannon is appointed as a UNICEF global champion for education. He is one of seven Generation Unlimited Champions who advocates worldwide for the development of UNICEF’s Gen U programme.
At the 2020 Irish general election, Cannon is elected to the second seat in Galway East. He continues to serve as a minister of state until the formation of a new government on June 27, 2020.
On March 19, 2024, Cannon announces that he will not contest the next general election, blaming a “toxicity in politics.”
Cannon is a musician and songwriter, and recently collaborated with Irish folk singer Seán Keane and others on songwriting projects. One of his co-compositions, “Nature’s Little Symphony,” is performed in Dublin by the RTÉ Concert Orchestra as part of the national Cruinniú celebrations on Easter Monday 2017. Both “Nature’s Little Symphony” and another of his compositions, “Gratitude,” are featured on the album Gratitude recorded by Keane and the RTÉ Concert Orchestra in 2018. On the August 10, 2018, Cannon plays piano with Keane and the RTÉ Concert Orchestra as part of a sold-out performance at the National Concert Hall. In 2019, he composes “An Túr,” a short piano instrumental to celebrate the birthday of W. B. Yeats.
In 2021 Cannon is commissioned to compose the soundtrack to a poem by Emily Cullen as part of the national commemoration of the signing of the Anglo-Irish Treaty in 1921.
In March 2024, Cannon begins presenting The Grey Lake Cafe, a radio show on Loughrea Community Radio featuring his own musical choices, and interviews with public figures who have a passion for music.
Cannon is also an avid cyclist and cycling safety advocate. He specialises in endurance cycling challenges and on June 19, 2021, he cycles Ireland end to end, a distance of 575 km, in 23 hours and 23 minutes, to raise money for charity.
On July 2, 2021, Cannon is involved in a road traffic collision and suffers serious injuries. On July 2, 2022 he marks the first anniversary of the incident by cycling 500 km around the border of County Galway. Marking the same date in 2023, he cycles 935 km (581 mi) in 56 hours, covering all 32 counties of the island of Ireland while fundraising for Hand In Hand, a charity that supports families challenged by childhood cancer.