Berger (pictured) - who was among the founders of breakaway political party Change UK last year before switching to the Liberal Democrats - will join Edelman's corporate affairs leadership team led by general manager Hugh Taggart.
Her role is MD, advocacy and public affairs. She replaces James Morris, who left earlier this year to join PwC.
Berger was MP for Liverpool Wavertree between 2010 and 2019. She left Parliament after the 2019 general election following an unsuccessful bid to become Lib Dem MP for Finchley and Golders Green in London.
Her roles on Labour's front bench included Shadow Minister for Energy and Climate Change, Shadow Minister for Public Health and Shadow Cabinet Member for Mental Health. She was latterly Lib Dem Shadow Spokesperson for Health, Social Care and Wellbeing.
Before entering politics Berger held several senior roles in business and the public sector, including at Accenture - where she advised the Prime Minister’s delivery unit, the Treasury and the Department for Culture, Media and Sport - and at the NHS Confederation and Labour Friends of Israel.
At Edelman, Berger will sit alongside Jeremy Lucas and John Kiely, managing directors overseeing corporate reputation and financial communications respectively.
Taggart said: “In Luciana we have a leader, a campaigner and an advocate with a whip smart political mind, an outstanding record of delivery, and that rarest of attributes - respect across the political divide. Luciana’s shadow ministerial experience - in particular in public health and climate change - will be invaluable to our clients as they seek to navigate a raft of societal changes, challenges and concerns.
"Luciana embodies our approach to action-based leadership, is widely recognised for her tenacity as a campaigner and will bring a dynamic approach to how we deliver integrated advocacy and public affairs programmes for our clients.”
Berger said: “I’m thrilled to be joining Edelman UK to lead the advocacy and public affairs team. As Edelman has evidenced, there has never been a more important time in my lifetime for governments, companies, NGOs and the media to build trust. People now rightly expect the institutions around them to educate, advocate for change but above all else to lead by example. I can’t wait to deliver campaigns which bring together the formidable political, research, creative and digital capability from within Edelman, to make a difference across the UK and beyond."
Berger left Labour in February 2019 due to what she described as "a culture of bullying, bigotry and intimidation". She had been particularly critical of the party's lack of action on Anti-Semitism under then-leader Jeremy Corbyn.
She was among the seven former Labour and Conservative MPs to form Change UK last year - also known as the Independent Group and the Independent Group for Change - amid criticism of the two established parties. She moved to the Lib Dems in September after the new, anti-Brexit party split.
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