Boast joins from Smartclip, the video ad network, where he was commercial director for just over two years.
Prior to Smartclip he was at MediaCom for 11 years, where he was most recently head of trading at board director level.
Boast replaces Luke Aviet, who in April was appointed managing director of AOL Advertising UK, three months after AOL acquired Goviral for £61m.
In this new role, Boast will be responsible for running and building Goviral's business in the UK and developing advertiser and publisher relationships. He will report directly to Aviet.
The appointment follows AOL’s May launch of the AOL Advertising.com group, which contains properties including Goviral, Advertising.com and Pictela.