Kelly Agathos | Managing Director

Kelly first discovered improvisation in 2010 and instantly fell in love with the art form. Soon after, she made her mark on Brussels’ fledgling anglophone improv scene by starting ATC Improv in 2012 and The Ghost Sheep in 2013, with whom she taught and performed for 5 years. In 2017, Kelly founded ImproBubble to deepen, broaden and professionalise the range of improv opportunities in Brussels, aiming to give future students all the tools they need to become a truly well rounded improviser.

She is also a sought after facilitator, combining her past experience as an EU affairs professional with improvisation to create tailor made corporate trainings, teambuildings and company events both in Brussels and abroad.

Aside from running ImproBubble, Kelly teaches, directs and performs throughout Europe both in improv festivals and as an invited guest. Between 2020-2024, Kelly was the curator and producer of all anglophone shows at the Improviste theatre. She is also the co-founder and host of The Schuman Show, a comedy show mixing improv, stand up and sketch focused on EU politics and of Storytelling Brussels (@storytellingbrussels), a new storytelling night in Brussels modeled after the storytelling hub Mezrab in Amsterdam, where Kelly discovered and was inspired buy the art of performative storytelling.

For more information, visit www.kellyagathos.com

Rozana Radu | Artistic Director & Instructor

Rozana Radu is belgian-romanian actor, improviser, trainer and director. After working in Romania's cultural scene for over 15 years doing theatre, film, television and improvisation, she moved to Brussels in 2017 and joined ImproBubble from its early days. Having worked with many world reknown improvisation artists like Joe Bill, Tim Orr, Inbal Lori, Jill Bernard, to name just a few and having participated in festivals in Chicago or Amsterdam, made her a perfect fit with Kelly's vision of how this art should be performed and approached.

Due to her unequivocal love for theatre, in 2022 she began collaborating with The Bridge Theatre Brussels as an actor and trainer and believes in art as a tool for a more inclusive society. She is also a member of La Compagnie qui Petille, a french speaking theatre company, who tackles with strong, impactful subjects on stage. Last, but not least, she is a regular cast member of The Shuman Show, Brussel's most popular sketch comedy production, which portrays daring and acute political issues with humor and wit.

On a different note, she enjoys travelling, as she finds it both therapeutic and enriching. And she still hopes to learn capoeira one day…!

Vincent Van Niewenhuyze | Instructor & Improv Jam lead

Hailing from the charming city of Ghent, Vincent is a seasoned improv player, teacher, and coach with over 15 years of experience bringing scenes to life.

By day, he is a project and process facilitator, tackling the corporate world with the same creative flair he brings to the stage. But when the clock strikes geek o’clock, this neurospicy dynamo dives into his other true passions: gaming (mostly MMORPGs), rolling the dice in Dungeons & Dragons, and embracing full-on otaku status with an ever-growing anime watchlist.

On stage, he is all about creating magic through intimacy, warmth, and boundless energy, making every scene feel fresh and fun. Offstage, he’s just as passionate about helping others unlock their creativity, keeping the fun in fundamentals, and exploring themes of gender and queerness in performance.

Whether he’s teaching, rocking an improv stage, leading a dungeon crawl, or leveling up his character online, Vincent’s motto is simple: “You be you!”

Sara de Sable | Instructor

Sara is a Dutch/English theatrical improviser, writer and community artist living and working in Brussels.

She studied Fine Arts at the Gerrit Rietveld Academy in Amsterdam, but always experimented with the performative elements of visual arts, and with her own body as visual material. She is a professionally active improviser in and around Brussels, and teaches improv and art in the socio-artistic sector.

Sara is part of several improv teams and shows, teaches at Improbubble, and also often hosts improv jams.

She has an improv duo show with a local musician, called SPLONK!, where an exchange between sound, music and visual art and the audience's input are the focus. Sara has made several visual site-specific/interactive installations in public space over the last thirteen years. She also teaches improv to youngsters, kids, and people who are learning Dutch.

With a love of authentic, quirky and vulnerable improv, she is not afraid to show herself on stage and invite you into her universe.

(photo credit: Ken Clijmans)

Johan Minnebo |

Don’t hold that ridiculous title against him. Johan is our kindhearted, hardworking writer and designer from Antwerp. Once upon a time he studied at ImproBubble. Long story short: one thing led to another, and ...

Long story long: Johan has taken many classes and courses at ImproBubble. One of the first ones was 'the Hero’s Journey' by Ben Hartwig. Johan made a visual summary, and showed it to Ben. Ben loved it so much he wanted to use it himself. Then Kelly saw it and she loved it as well. So the summary became a poster on the wall in the venue (which to this day attracts a lot of attention), which led to a full poster-commission, which led to a series of illustrated quotes in the venue, which led to Kelly asking Johan a few questions about Facebook ads, which led to Johan learning Canva, which led to Johan making all our social templates, which led to Johan completely rebranding ImproBubble, which led to Johan saying: "new branding and identity, that's all very fine, but what about the website?" To which Kelly replied: "The last one took forever. I can't go through that again." which led to Johan writing, coding and designing the core of a brand new website (spoiler: it's the one you're browsing right now) in a single week, which led to Johan needing premium tools, which led to Johan discovering a lot of ImproBubble's revenue went to third party event-apps, which led to him helping us stand up against the outrageous fees these apps charged us, which led to the reinvention of the site as a webshop, which contributed to ImproBubble getting more visitors and students, which led to a new need for clarity in our offerings which led to Kelly, Phil and Johan renaming the ‘school’ ‘ImproBubble Academy’ and all our levels getting their own page, which led to the 'birth' of level VI and the long awaited ImproBubble diploma that will be designed by — you guessed it — Johan. Which led to ... well nothing. Everything was fine and dandy for a few months, and then corona happened. Which led to Johan helping setting up and branding our remote activities. Which led to Johan designing a donor drive. Which led to an opportunity for merchandise. Which led to that cool tote bag you see everybody wearing. And he assured us, that that, is just the beginning. So yeah, he must have really done something right because ...

... before he knew it, we made him part of the team (and offered him that title). Not just because of his creative and communications skills, but because he is 'a master of yes-and-ing in real life’. Kelly’s words, not his.