The Agency

Born in 1996, Duval Guillaume is the agency that reshaped Belgian advertising.
The entrepreneurial spirit and ongoing creative energy resulted in one of the most respected agency portfolios in the landscape.

Part of the Publicis Groupe since 2006, we always stayed true to our creative roots, using the power of creativity to grow our clients’ brands and business.
Our agency’s culture serves creativity. Because creativity generates impact. This impact should always be positive, for our clients but also for society.
Let’s start a conversation. Because creativity means growth.


The Team






Managing Partner/
Creative Director




Chief Digital Brands & Integration, Publicis Groupe Belgium

After her studies Communication Management, Elke Janssens started at LDV United as Account Manager on brands like De Standaard,, Kind & Gezin en Fostplus.

8 years and 1 Golden Effie later, she switched to Duval Guillaume as Business Unit Director to lead the accounts of Carlsberg Group,, AXA and Febelfin. Elke made a stopover of 2,5 years at Happiness Brussels as Managing Director before she rejoined Duval Guillaume’s management in 2018.

Elke means ‘every’ in Dutch. That’s probably why she believes that every brief, every client and every day offers opportunities to create groundbreaking work. She’s very passionate about cultivating the strong DNA of creativity and building lasting relationships with like-minded partners.

Elke loves her mini-me, Coco.

Jessica Danese’s career began at Air, partner of McCann. Her next step led her to Little Brain, an agency specialised in healthcare communication. In 2010, she joined Polygone as a Sr. Account Executive and worked with Cointreau, Bulex and Febiac. Her next adventure brought her to McCann Brussels where she worked on many accounts such as Opel, L’Oréal Paris, Bulex and Vache Bleue.

She decided to join Publicis Brussels in 2014, first as Account Manager, and one year later as Account Director for Oasis, Fintro and Sanofi until she dreamed bigger and became Business Development Director. In the summer of 2017, Jessica had the opportunity to reinforce Duval Guillaume’s management team.

Jessica loves creating real connections. She’s always there to listen, help, challenge and empower people to bring out the magic within them. Organisation, details and processes are 3 of her favorite words. She also likes to travel, discover new restaurants with her lover and meet her friends as much as she can.

Passionate about engaging advertising, Koenraad Lefever eagerly started working in the advertising industry. After rocking network agencies (Y&R and McCann) and independent agencies (LDV United and Mortierbrigade), he joined the creative forces of Duval Guillaume to put the agency back on the map.

Koenraad worked for clients such as Carlsberg, Durex, Coca-Cola, Red Cross, AXA, Bundesliga, Nike, Ray-Ban, Opel, Ford, De Standaard, Humo, Opvoedingslijn, Air France and USG People. His work was repeatedly awarded on major creative festivals such as Creative Belgium, Eurobest, Cannes Lions, NYF, Effie, Oneshow and D&AD.

He did not win any significant prizes yet in golf, ice hockey or snowboarding but is still working on it.

After his studies in law and communication, Jorian Vanvossel started his professional career as an academic researcher at imec-SMIT-VUB, studying the written press. He soon made the switch to the advertising industry at the sides of These Days Y&R (now Wunderman Antwerp), rolling out content strategies for BNP Paribas Fortis, Devos & Lemmens and Telenet.

Having spent almost 5 years in Antwerp, he found a fresh start in DDB Brussels as a Strategic Planner. Working on brands like IKEA, Audi,, Volkswagen and Belgian Brewers made him dive deep into creative business solutions for brands with a great heritage. With his strong belief that creativity is the firestarter for effectiveness, Jorian joined Duval Guillaume in 2018.

Perseverance and the ability to putting things into perspective are two of his main assets, whether he’s getting creatives and clients on-board for fresh strategic routes, displaying of training for a triathlon.

Karel Vinck started his career at GV/Company in 1992. After 3 years at Y&R and 5 years at BBDO, Karel became Managing Partner at Duval Guillaume.

For nine years, Karel has lifted the agency to a position that is both locally and internationally recognized. Karel has won many Effie awards with Duval Guillaume, for clients like KBC, Lays, Weight Watchers and AXA.

For him, this easily proves that creativity and effectiveness go hand in hand. Since 2017, Karel is responsible for the Publicis Groupe brands in Belgium, together with Eva Devos.