Prosek Partners Expands UK Integrated Marketing Offering with Key Hires

Kostas Karanikolas, Jonathan Walker and Sara Haney join London team.

London, UK — 20 May 2025 — Prosek Partners, a global integrated marketing and communications firm for financial and professional services, today announced that it has expanded its strategic branding, and integrated marketing arm – Prophecy – in London. The platform offers award-winning brand strategy, design, digital and advertising capabilities to clients across a broad spectrum of businesses, including corporates, financial and professional services.

Kostas Karanikolas joins as an Executive Creative Director. He brings over 20 years’ experience in creative branding and marketing across industries including finance, consumer, technology and healthcare. Kostas joins from FleishmanHillard, where he served as Executive Creative Director, and has previously held roles such as Global Creative Director at WPP and Saatchi & Saatchi, working with major global brands on developing breakthrough brand platforms and integrated campaigns. At Prosek, he will lead the London team’s creative offering, working closely with the firm’s leadership and the rest of Prophecy to develop the integrated marketing vision for the firm in London and beyond.

Jonathan Walker joins as a Senior Vice President and Integrated Account Lead across Prosek’s Digital and Prophecy businesses, helping further bring together brand, digital content, paid media and advertising as one service. Jonathan brings over 15 years’ experience working with complex global organisations on their brand, marketing and communications. He joins Prosek from Mammoth, a full-service brand and digital agency, where he served as a Key Account Director, leading brand transformation projects and multi-discipline campaigns for international clients to drive brand growth, lead generation and its sales pipeline. Jonathan has previously held senior roles at agency brands within Publicis Groupe and Omnicom Group.

Sara Haney, Design Director, joins Prosek’s London team from the firm’s New York office, bringing more than eight years of institutional knowledge of the team’s operations as well as specialist skills across visual identity, design systems, brand storytelling and web design.

“We are very excited to have Kostas and Jonathan on board. They both bring deep experience in their respective specialities and will play a key role in building out our bold integrated offering in the UK market and globally,” said Neil Goklani, Partner and Head of Prophecy. “Kostas’ creative experience is a tremendous addition to further strengthen our campaign development and visual design excellence for our clients. Sara’s many years at Prosek give her key institutional knowledge to be able to provide excellent creative support as we grow our integrated model in this marketplace.”

Dan Allocca, Partner and Head of Digital, Paid and Analytics, said, “Jonathan’s knowledge of crafting multi-disciplinary campaigns will ensure we are combining all our different offerings strategically and seamlessly across our full suite of capabilities.”

Stephen Lewis, Partner and Head of London, added, “It’s an exciting time for Prosek in London.  We are investing and growing quickly, and the addition of Kostas, Jonathan and Sara will offer even more firepower, capabilities and creativity to our clients.”

About Prosek Partners
Prosek Partners builds – and protects – the top brands in business. We are a certified Woman-Owned Business and among the largest independent, integrated communications and marketing firms globally. Specializing in providing a full range of communications solutions to financial and professional services companies, Prosek delivers business impact through an unexpected level of passion, creativity and marketing savvy. Services include media relations, thought leadership, social and digital media, public affairs, investor relations, financial communications, transaction services, crisis communications and issues management, content creation, conference support, publishing, media training and more. Prosek’s strategic branding and integrated marketing arm – Prophecy by Prosek – offers brand strategy, award-winning design, digital and advertising capabilities. Prosek has been named PRWeek’s Best Place to Work, PRovoke Media’s “Global and North American Financial Agency of the Year” and a top five global M&A and shareholder activism agency. For more information, please visit www.prosek.com or follow the firm on LinkedIn. 

Media Contact
Isabella Durant
idurant@prosek.com
(+44) 753 5321 857