Meet the Team

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Management - Your Connection to the Network

Our Management Team provides the strategic direction that drives our global network forward. With vision, experience, and a strong commitment to our values, they ensure sustainable growth, guide innovation, and foster collaboration across all regions. Always forward-thinking, always accountable.

Muriel Mercier

Director Business Development

+49 (0) 40 80 90 729 – 60
Muriel.Mercier@unisonsteadfast.com

Rolf Hiroshi Diekhoff

Director Account Management

+49 (0) 40 80 90 729 – 20
Rolf.Diekhoff@unisonsteadfast.com

Assistants to Management

Polina, Melinda and Kathrin form an essential support system for our management team while also playing key roles in Marketing and HR.

Polina strengthens our global presence by managing major events such as the Independence Day Conference (IDC), RIMS, and others.

Melinda oversees our internal communication and learning platforms, including Unison Times and the Unison Academy.

Kathrin, in her dual role as HR Manager and Assistant to Muriel, is responsible for all human resources matters and provides direct assistance to Muriel.


Muriel Mercier

Executive Assistant to CEO

+49 (0) 40 80 90 729 – 15
Polina.Balko@unisonsteadfast.com

Melinda Keller

Management Assistant/ 
Content Editorial Manager


+49 (0) 40 80 90 729 – 16
Melinda.Keller@unisonsteadfast.com

Katrin Ritter

Management Assistant Business Development & HR

+49 (0) 40 80 90 729 – 20
Rolf.Diekhoff@unisonsteadfast.com

Supporting Teams

Behind the Scenes – Driving Growth
 Our Finance, IT, and Marketing teams work behind the scenes to keep everything running seamlessly — from numbers and systems to communication and creativity. While Melanie and Elena ensure financial clarity, Marta shapes the company’s visual identity and strategic communication. Thanks to Nikolaj, we stay ahead with the latest technological innovations.

Melanie Schmalenberg

Manager Finance

+49 40 8090729-32
Melanie.Schmalenberg@unisonsteadfast.com

Elena Burmann

Junior Manager Finance

+49 40 8090729-26
Elena.Burmann@unisonsteadfast.com

Marta Podkowinska

Marketing Manager/ Brand Designer

+49 157 512 83 777
Marta.Podkowinska@unisonsteadfast.com

Florencia Fernández-Sanders

Project Assistant

+49 140 8090729-19
F.Fernandez-Sanders@unisonsteadfast.com

Nikolaj Petak

Senior System Engineer

+49 40 8090729-41
Nikolaj.Petak@unisonsteadfast.com

Account Management

Your Connection to the Network
Our Account Management Team is at the heart of our global operations. 
With hands-on expertise and a solution-driven mindset, they support our partners across all regions — building strong relationships, coordinating international programs, and finding the right answers fast. Always connected, always committed.

Jenny-Annett Kubina

Senior Account Executive/ UnisonSteadfast Liaison Officer Southern Europe and Latin America

+49 (0) 40 80 90 729 – 23
Jenny.Kubina@unisonsteadfast.com

Mailin Mühlheim-Kasiura

Senior Account Management

+49 (0) 40 80 90 729 – 25
Mailin.Muehlheim@unisonsteadfast.com

Marijana Ivkovic

Junior Account Manager

+49 (0) 40 80 90 729 – 95
Marijana.Ivkovic@unisonsteadfast.com

Michelle Gerstner

Junior Account Manager

+49 (0) 40 80 90 729 – 95
Michelle.Gerstner@unisonsteadfast.com

Acelya Kalayci

Account Assistant

Acelya.Kalayci@unisonsteadfast.com

Nastassia Poholski

Account Assistant

Nastassia.Poholski@unisonsteadfast.com

Svenja Adam

Account Assistant

Svenja.Adam@unisonsteadfast.com

Our employees in the spotlight

Marijana Ivkovic

Junior Account Manager

“As part of the Account Management team at UnisonSteadfast, I get to work with great colleagues around the globe , and no two days are ever the same.”

Jenny-Annett Kubina


Senior Account Executive

“At Unison, I not only completed my training, but also had the opportunity to grow both professionally and personally.


What I particularly value is the international collaboration with our partners around the world, the open and supportive team culture, and the chance to specialize in exciting areas.

For me, Unison is an employer that offers real perspectives and a place where you can truly develop your potential.“

Florian Gude

Account Manager

“Anyone who thinks the insurance industry is dull clearly doesn’t know UnisonSteadfast.
 In the international field, we regularly receive exciting inquiries on unique and specialized topics.
 When it comes to professional development, there is also a lot on offer – from language courses and webinars to many other opportunities.
 On top of that, we are a wonderfully diverse group of people with a wide range of backgrounds and experiences.
 This exchange and collaboration create an inspiring atmosphere.“

Working at UnisonSteadfast – international, diverse, inspiring.

Working at UnisonSteadfast – international, diverse, inspiring.

At UnisonSteadfast, no day is like the other – this is where international insurance business meets team spirit and curiosity.
 Our diversity of people, topics, and ideas makes work exciting, dynamic, and full of opportunities to grow.

 

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