The moves are part of parent Publicis Groupe's effort to convert its PR assets to the MSL brand.
WPP's joint COOs Mark Read and Andrew Scott have said they do not believe a break-up of the ad group makes sense.
Barker was most recently global chief talent officer at Wavemaker, a WPP media, content, and technology agency.
Jonathan Lomax has been hired by MSL to lead its London corporate comms and reputation management practice, with another senior director also starting.
Kopparberg has taken on a new UK PR agency after a four-way pitch that included incumbent of four years W Communications.
With the current momentum around the #metoo movement, it feels like we're all talking, writing and pushing for gender equality like never before - however, despite the beginnings of a cultural shift, some communications strategies remain stuck in the mud.
Publicis Groupe's net revenue grew organically by 1.6% to €2.1bn (£1.8bn/$2.6bn) thanks to account wins in 2017 that included McDonald's and Diesel.
The Commonwealth Games in Australia are now over, but there's still one more set of medals to hand out - for the event sponsors.
In two words: it depends.
Staffordshire Fire and Rescue Service has launched a campaign urging people to 'Get out, stay out' in the event of a fire, juxtaposing the humorously psychedelic in a musical video with the distressing real-life stories of victims.
Greater Manchester Police has equipped its traffic police with teddies to help comfort traumatised young children at the scenes of road accidents.
A Parliamentary select committee has called for NHS Digital to suspend a controversial data-sharing agreement with the Home Office to trace and deport immigration offenders that, it says, breaches current confidentiality rules.
In the fourth of PRWeek's series on voter-registration and turnout campaigns, we take a look at how South Tyneside Council's comms team is making the most of its limited resources to tell local residents to 'Have your say'.
The Scottish Government is extolling to the world the virtues of living, working, studying, investing in and visiting Scotland with a £6m global ad and comms campaign using the banner 'Scotland is now'.
The University of Sussex has created its first director of external relations role, promoting Michelle Gordon to the position.
PR Account Manager Full Circle Communications City of London
Senior Account Executive - Account Manager - Global Travel Clients PR Futures London (Central), London (Greater)
Associate Director - Employer of Choice PR Futures London (Central), London (Greater)
PR Account Manager Wake Media London (Greater)
Senior Account Executive Flame PR London (Central), London (Greater)
For an island only 47 square miles marooned in one of the Earth's most remote spots, St Helena has a surprisingly rich history. Is your agency the one to unlock it for the world?
Getting great, effective editorial coverage is a boxing match between brand and editorial - you have to be clever about it and respect the rules of the game.
Exposure is as important as it has ever been, but achieving it means more than just shouting into the ether. How can a more targeted social media strategy help?
Influencers overtook celebrities as the most popular choice for endorsements in 2017, according to new research by Celebrity Intelligence. It's a trend that will continue throughout 2018.
"In today's global B2B market, competition has never been fiercer. Brands should use every opportunity to differentiate themselves and engage audiences through braver, bolder content and campaigns. But how?"
How did Guinness World Records and Jaguar work together to make headlines?
PRWeek, in partnership with Cision, conducted a global survey of CCOs, CMOs, SVPs and presidents to better understand the challenges PR professionals are facing.
PR is fun, and agency life is even more fun. And our agency is hella fun. So, the kooky, cool, creative part of our agency must be ultra fuuun, right?
The Ryanair debacle continued to hog the business pages this month. Then Monarch Airlines collapsed, triggering the greatest peace time repatriation effort in British history - and a clashing of heads between the political and corporate worlds.
New PR careers hub will showcase employers in the PR and communications industry and more.