Turner, who has been named trade marketing executive at SHG, will take up her new role on 17 November reporting into sales director UK and Ireland Simon Garrido.
Quibell, Sellman and now Turner all join SHG after On the Beach Group announced in September it would shutter its B2B operation with immediate effect. It has, however, retained B2B director Si Morris-Green to head up an expansion into cruise.
The appointments follow TravCorp Holdings' acquisition of Specialist Holidays Group in July, which houses former Travelopia brands Citalia, American Holidays and Sovereign Luxury Travel.
SHG said Turner would bring "extensive" trade marketing and agent engagement experience to her new role, focusing on campaigns, communications, incentives and events to drive growth.
Quibell, meanwhile, joins as head of trade partnerships, and Sellman as trade partnerships manager. The pair will work alongside existing SHG trade partnerships manager Luke Swarbrick.
“She [Turner] brings creativity, energy, and a deep understanding of the trade marketing landscape," said Garrido. "Alongside Jorge, Kim and Luke, Chloe’s appointment enables us to further accelerate our trade strategy and deliver even stronger results for our partners."
Turner added: "I’m excited to join such a stellar team at Specialist Holidays Group - and one I know quite well already - under the new ownership of TravCorp Holdings. We have a significant opportunity to build business from our trade channels and I’m really looking forward to getting started."
Sellman took up her role with SHG on Monday 3 November with Quibell starting on Monday 10 November.