Management Team

Fabrice Sergent, Founder and Chief Executive Officer, Cellfish

Fabrice Sergent is the Founder and Chief Executive Officer of Cellfish, a company he founded in 2004. He is a media and Internet entrepreneur based in the New York headquarters.

Sergent is also the chair of the Advisory Board for the Mobile Giving Foundation, for which Cellfish provides the technology platform in order to process mobile-giving transactions.

From 1993 to 2006, Sergent was CEO of Lagardère Active Broadband, the digital arm of Lagardère, a French-based media publisher. As such, he was a member of the Executive Committee of Europe 1 Communication, which became Lagardère Active.

From 1994 to 2001, Sergent was Founder, Chairman & CEO of Club-Internet, one of the largest French ISPs, which later was purchased by Deutsche Telekom’s T-Online for an historical 1.2 B€ transaction, a landmark deal in the European new media space for its time.

Additionally, Sergent served as a member of the supervisory board of Deutsche Telekom’s T-Online, the largest European ISP, and a member of the boards of Europe1 Interactive, Hachette Multimedia and Le Monde Interactif (lemonde.fr).

Sergent holds an MBA from Institut Telecom.

Back to Top

Julien Mitelberg, Co-founder & Chief Operating Officer, Cellfish

Julien Mitelberg is the Co-Founder and Chief Operating Officer of Cellfish, based in the New York headquarters. Mitelberg is responsible for bringing together a team of highly skilled professionals between offices in New York, San Diego and Montreal that now work with the most popular U.S. sports and entertainment franchises including the NFL, NBA, NHL, adidas, Marvel, Universal Music and FOX STUDIOS. 

Mitelberg was instrumental in securing Cellfish’s September 2011 acquisition of Bandsintown, an award-winning concert discovery application on Facebook, iOS and Android for live music fans and artists. Since the acquisition, he has assumed the role of CEO and has been heavily involved in Bandsintown’s development, particularly its expansion into mobile platforms and into new geographic markets.

In 2004, Mitelberg established Cellfish’s U.S. business and worked with top U.S. carriers and hip-hop producers to launch BlingTones, the world’s first wireless record label. Prior to Cellfish, Mitelberg was the COO for 11 years of Lagardère Active Broadband. In 1995, Mitelberg co-founded Club-Internet, which was purchased by Deutsche Telekom’s T-Online International AG, Europe’s largest ISP, for a historical €1.2B transaction.

In 1994, Mitelberg was the Founder & CEO of Le Studio, one of the first and largest French web agencies. Le Studio developed Club-Internet’s portal and numerous other websites for major French brands.

Mitelberg holds a Master of Science from Institut Telecom.

Back to Top

Nicolas d’Hueppe, Chief Executive Officer, Cellfish Europe

Nicolas d’Hueppe is the CEO of Cellfish Europe, based in the Paris office.

From 1998-2000, d’Hueppe launched and ran the first online booking site of the Accor Group, accorhotels.com, before he joined the business development team of Lagardère Active Broadband for its mobile launch, notably with Plurimedia. In 2002, he became the Internet Distribution Manager and, subsequently, the CEO of Cellfish France, four years later.

d’Hueppe graduated from HEC Lausanne and University of Paris Dauphine.

Back to Top

Muriel Lelandais, Chief Executive Officer, Cellfish Canada

Muriel Lelandais is the Chief Executive Officer for Cellfish Canada, which develops the technological capital of Cellfish by ensuring sustainability of products, process efficiency and team expertise. She launched the Montreal office in June 2007, where she is based.

Lelandais’s team consists of developers and engineers who serve as Cellfish subsidiaries with technical solutions and infrastructures to support their products and business. She oversees the development, deployment, operation and maintenance of back-end solutions that require complex and innovative architecture, robust hosting and high performance. Additionally, her team develops user applications
and front-end interfaces for the U.S. market.

As early as 1995, Lelandais began working with Cellfish CEO & Founder, Fabrice Sergent, in the creation of Club-Internet. Since then, she held successive operational and administrative positions for Lagardère Active Broadband’s executive team, including business development project manager and general secretary.

Lelandais is a graduate from Ecole Supérieure de Commerce de Montpellier.

Back to Top

David Weisz, Chief Marketing Officer, Cellfish

David Weisz is the Chief Marketing Officer of Cellfish and is based in the New York headquarters.

Appointed in 2002 to Vice President, Weisz led the marketing and business-development functions for Lagardère Active Broadband, the digital arm of Lagardère Group, one of the world’s largest media groups.

Prior to Lagardère Active Broadband, Weisz worked at Legion Group, where he was responsible for the company’s international business development, notably for the creation and management of subsidiaries in Greece, Brazil, Singapore, Taiwan and Poland. He started his career at Thomson Publishing, where he held various sales and marketing positions.

Weisz holds an Economics degree from Leeds University, as well as an Executive MBA from the London School of Business.

Back to Top

Dan Nemo, Chief Financial Officer, Cellfish

Dan Nemo is the Global Chief Financial Officer of Cellfish, where he is responsible for the company’s overall finance, legal and human resources functions. He joined the company in May 2011, and is based in the New York headquarters.

Nemo has over 12 years’ experience in mobile technology, having worked in a variety of finance, corporate development, business development, product management and legal functions at TextGuard, RealNetworks, WiderThan, Ztango and MobileSpring. Most notably, Nemo acted as deputy CFO and general counsel of WiderThan, taking WiderThan public on NASDAQ in 2005, and leading WiderThan’s ultimate sale to RealNetworks in 2006. At RealNetworks, Nemo served as VP, Corporate and Business Development. Nemo started his career practicing law at Thelen, Reid & Priest and Sullivan & Cromwell, negotiating corporate finance and mergers & acquisitions transactions for telecommunications companies.

Nemo earned his bachelor of arts in history from Stanford University, a JD from George Washington University and an MBA in finance from Columbia University.

Back to Top