Gavin is a lifelong East Belfast resident. He attended Grosvenor Grammar School in East Belfast. While he was further educated at Queen's University Belfast, he read Law and attained a Masters in Irish Politics before commencing practice as a barrister.
Gavin was a member of Belfast City Council from 2010 until 2015, first for the Pottinger District Electoral Area and then for the newly created Titanic DEA.
He served as the Lord Mayor of Belfast from June 2012 until June 2013 when his leadership was recognised during a difficult period for the city.
Gavin was elected as the Member of Parliament for East Belfast on 7th May 2015 and has since been re-elected in 2017 and 2019. He is currently the DUP spokesperson for Defence and Home Affairs. He also sits on the Defence Committee.
Gavin was elected as the Deputy Leader of the DUP on 9th JUne 2023.
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