Guillaume Rostand
Co-founder and CMO
Guillaume Rostand founded Iter Advisors with Benjamin Ziza and Sébastien Doat. A French entrepreneur based in Barcelona since 2011, he brings the firm his experience in digital marketing, business development and supporting founders.
As co-founder and CEO of AI Summit Barcelona, he now devotes a significant part of his work to artificial intelligence applications and bringing together businesses, researchers, investors and technology communities.
Profile updated on
LinkedIn profileA career across France, China and Barcelona
Educated at CELSA and then Sciences Po, Guillaume Rostand began his career in media and digital businesses, including NRJ Group and eBay France.
He continued his career at Myfab in Shanghai, then at InstantLuxe in Paris. In 2011, he moved to Barcelona to lead marketing at Splendia before developing a marketing and e-commerce consulting activity.
From 2017 to mid-2026, he led marketing at Liligo, the French travel search engine, overseeing search, acquisition, CRM and content production.
Alongside this, he chaired French Tech Barcelona from 2019 to mid-2026. He helped connect the French and Spanish ecosystems around funding, business development and talent mobility.
His role at Iter Advisors
At Iter Advisors, Guillaume contributes to the firm’s positioning, development strategy and relationships with entrepreneurs. His experience complements that of Benjamin Ziza, Sébastien Doat and the teams responsible for finance engagements.
He understands the questions business leaders face when developing their activities: finding customers, building a clear offer, organising growth and bringing together the skills needed at each stage.
This experience informs a conviction shared by Iter’s partners: commercial and financial decisions must inform each other. An ambition for growth needs a market, a team and a clear understanding of the resources available to make it happen.
Areas of experience
Digital marketing and business development
Guillaume has spent most of his career in marketing, customer acquisition and content. His experience includes organic search, acquisition campaigns, CRM, offer positioning and organising marketing teams.
At Iter, this perspective helps connect the firm’s services with business leaders’ practical needs.
Investment and support for entrepreneurs
An investor in 25 startups, particularly in B2B SaaS and marketplaces, Guillaume is as interested in teams as he is in business models.
His involvement with founders takes several forms: discussing positioning, sharing growth experience, opening a commercial relationship or helping find a relevant contact. He also contributes to this collective approach through Le Club Startup, which he co-founded.
Technology ecosystems and artificial intelligence
His involvement in French Tech Barcelona, followed by the creation of AI Summit Barcelona, has led him to work with entrepreneurs, institutions, investors and international technology organisations.
Projects built with others
Iter Advisors
The creation of Iter Advisors with Benjamin Ziza and Sébastien Doat draws on their complementary backgrounds. The firm supports businesses in structuring and managing their finance function. Guillaume contributes his experience as a marketing leader, entrepreneur and investor.
AI Summit Barcelona and AI Week Barcelona
Co-founded in 2025, AI Summit Barcelona brings together people who develop, fund and use artificial intelligence. Guillaume now leads the project with his partners and team.
The project also forms part of AI Week Barcelona, which brings together events and communities across the city. Its ambition is to encourage collaborations and make developments in AI more accessible to businesses.
Le Club Startup
Through Le Club Startup, Guillaume contributes to a collective approach to investment, based on analysing projects and working with entrepreneurs.
Interviews and public speaking
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