The round of redundancies will see Virgin Media's brand amplification team absorbed into its advertising and sponsorship divisions. This follows Liberty Global's acquisition of Virgin Media in June.
The two members of the brand amplification team that are set to leave alongside Dornan are Darren Brooks, brand and campaign manager and Joanna Menzies, brand executive.
Verity Henderson, senior PR and brand campaigns manager, will remain and Ellie Tory, head of brand advertising and sponsorship, will be responsible for amplification.
Dornan has held various positions at Virgin Media for 21 years, starting in 1992 as a manager at one of its Virgin Megastores, rising to PR and events manager, and then campaign manager at Virgin Unite, the brand's charitable arm. After a brief stint at T-Mobile as marketing promotions and events manager, he returned to the Virgin fold as head of consumer PR at Virgin Mobile.
He has been in his current role for as head of brand amplification for seven years.
Dornan told C&IT: "Following the acquisition of Virgin Media in June, Liberty Global announced a decision to lose 600 people across the business and that has resulted in this merger between the teams.
"Virgin Media's conferencing teams, which sit within HR and comms, seem to be less affected by the changes."
Dornan is to leave his current post at the end of December and is currently exploring new opportunities. he said: "I have no desire to set up my own business. I want to work with exciting brands that are interested in taking risks and challenging the norm. I am passionate about brand experiences. The magic part of events is that they drive PR, content sharing and talkability - that's what I really enjoy.
"I have been offered some consultancy work and I think I can offer a lot in an advisory role, but I will remain open-minded about the future."