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About
Martin Sieber studied molecular biotechnology at Heidelberg and cell biology at ETH Zurich, researched gene expression and innate immunity, and built websites freelance before moving into product development. He joined the ETH student team behind GetYourGuide, built and led its early product-management, UX and design function, then successively led native mobile products, performance marketing and product-driven growth. Public profiles currently describe him as Co-Founder and Director of Product or Director of Product, Growth; the narrower director remit sits below company-wide chief product officers appointed from 2019 onward and should not be confused with the CPO role. His attributable work includes the professional-supplier platform rebuild, mobile-app distribution and measurement, cross-channel attribution, pricing, supply data products and AI-assisted supplier tools. Separate from GetYourGuide's institutional investors, reporting documents a personal seed investment and advisory role in LocalUncle; directories also attribute Insightness, but no primary round source names him. A Berlin holding and consulting company managed by Sieber has existed since 2021, although its portfolio is not public. No authoritative check-size mandate, current open angel program, personal award, outside statutory board seat or realized personal return was found.
Invests in
AI & Machine LearningData & InfrastructureDeep TechMarketplacesTravel & Hospitality
Founder at GetYourGuide
Intro paths
In turn, Martin can intro founders to GetYourGuide's investors below.
GetYourGuide's investors · 16
Co-founders at GetYourGuide
Investments
Board seats
Insightness
Investor
InsightnessLocalUncle
Per curated public sources.
Founder fit — who Martin backs
Potential fit is an early founder with a concrete product, mobile, marketplace, pricing, attribution or supply-data problem and a specific request for operating advice. His biology background may help him understand science-led teams, but one unconfirmed neuromorphic-sensor investment does not prove a broad life-sciences or deep-tech mandate.
['late-stage-only capital requests', 'pitches that presume a public check-size mandate', 'generic networking requests without a product problem', 'company-financing claims confused with personal angel activity', 'namesake portfolios or the unrelated M. Siebers Ventures vehicle', 'claims of a profitable Insightness exit without ownership evidence']
How to pitch
Lead with the customer or supplier pain, product funnel, pricing or attribution evidence, and the exact product decision where Sieber's experience is relevant. Ask directly whether he is currently investing, through which vehicle and at what stage; do not infer availability or check size from directory pages.
Stages: angel, pre-seed, seed · Sectors: Travel technology, Marketplaces, Mobile products, Product analytics and attribution, Pricing, Supply data products, Applied artificial intelligence, select deep technology
Editorial inference from Martin's portfolio, writing and public record — not a published mandate.
Investment themes
7 documented themes from Martin's essays, talks and portfolio, grouped by what they say about founders.
▶More themes7
Simple product solutions to complex systems
Product-led and measurable revenue growth
Native mobile product and app distribution
Cross-channel attribution and data-informed budget allocation
Marketplace pricing as growth infrastructure
AI-enabled supply data and supplier operations
Professional-supplier marketplace quality and scalability
Podcasts & interviews
featuring Martin SieberCXI Brand Talks speaker profile
cxi-konferenz.org · cxi-konferenz.org
GetYourGuide mobile-app attribution case study
studyres.com · studyres.com
Implementing an attribution tracking process at GetYourGuide
getyourguide.careers · getyourguide.careers
How GetYourGuide Makes Sightseeing Personal
aws.amazon.com · aws.amazon.com
World shaper of tomorrow: GetYourGuide leads the travel industry into the future
top100startups.swiss · top100startups.swiss
Writing
Frequently asked questions
- Who is the GetYourGuide co-founder Martin Sieber?
- He is the Berlin-based former molecular biologist who co-founded GetYourGuide at ETH Zurich and has led product management, UX, design, mobile, performance marketing and product growth. The stable LinkedIn handle is siebermartin.
- How many people founded GetYourGuide?
- Current GetYourGuide pages name Johannes Reck, Tao Tao, Martin Sieber and Tobias Rein. ETH/Venturelab histories also include Pascal Mathis, an early COO. The reason for the modern four-person roster is not publicly explained.
- When was GetYourGuide founded?
- The concept and course work began in 2007-2008, an alpha appeared in June 2008 and a beta in August 2009. GetYourGuide's public history uses 2009, which this dossier retains as the conventional founding year.
- What did Martin Sieber study?
- He earned a BSc in Molecular Biotechnology from Heidelberg University and an MSc in Cell Biology from ETH Zurich, with a growth-regulation focus and a systems-biology thesis.
- What has Martin Sieber done at GetYourGuide?
- He led product management, UX and design as VP Product, native apps as Head of Mobile, performance marketing and attribution in 2017-2018, and product-driven growth from 2019 onward.
- Is Martin Sieber GetYourGuide's Chief Product Officer?
- No public current source gives him that title. He is a co-founder and director-level product leader. GetYourGuide appointed Ameet Ranadive as its first CPO in 2019 and Rob Rekrutiak as CPO in March 2026.
- What product areas does Martin Sieber currently cover?
- His 2025 posts point to supply data products, applied AI and marketplace pricing, while his profile describes product-driven revenue growth. The exact internal reporting line and full domain boundary are not public.
- Does Martin Sieber invest in startups?
- Yes, at least once publicly: contemporary reporting names him as a seed investor and advisor in LocalUncle. Directories also attribute Insightness, but the reviewed primary seed announcement does not name him.
- What is MTN Ventures GmbH?
- It is a Berlin holding and business-consulting company, originally registered in 2021 as MTN Sieber Ventures UG, with Sieber as managing director. Its specific holdings are not public in the reviewed sources.
- What check size does Martin Sieber write?
- No authoritative or first-person source reviewed states a standard check size, stage mandate or active solicitation policy.
- Has Martin Sieber had a personal investment exit?
- Insightness was acquired by Sony in 2020, but directory attribution does not prove Sieber still owned shares or received proceeds. LocalUncle shut down in 2013. No profitable personal return is verified.
- Does Martin Sieber hold outside board seats?
- No outside statutory board seat was verified. LocalUncle is documented as an advisory role; Insightness is directory-attributed as investor/advisor, and its 2016 board announcement does not name him.
- What public personal background is known?
- He is a German-speaking, fluent-English product founder based in Berlin, educated in Heidelberg and Zurich and supported by a German national academic scholarship. Birth, family and hobby details are not reliably public.
- Who is Martin Sieber?
- Martin Sieber studied molecular biotechnology at Heidelberg and cell biology at ETH Zurich, researched gene expression and innate immunity, and built websites freelance before moving into product development. He joined the ETH student team behind GetYourGuide, built and led its early product-management, UX and design function, then successively led native mobile products, performance marketing and product-driven growth. Public profiles currently describe him as Co-Founder and Director of Product or Director of Product, Growth; the narrower director remit sits below company-wide chief product officers appointed from 2019 onward and should not be confused with the CPO role. His attributable work includes the professional-supplier platform rebuild, mobile-app distribution and measurement, cross-channel attribution, pricing, supply data products and AI-assisted supplier tools. Separate from GetYourGuide's institutional investors, reporting documents a personal seed investment and advisory role in LocalUncle; directories also attribute Insightness, but no primary round source names him. A Berlin holding and consulting company managed by Sieber has existed since 2021, although its portfolio is not public. No authoritative check-size mandate, current open angel program, personal award, outside statutory board seat or realized personal return was found.
Founder mafias
ETH Zürich mafia246
Also came through, then founded or led a company.
Heidelberg University mafia41
Also came through, then founded or led a company.
GetYourGuide mafia6
Also came through, then founded or led a company.
About this profile. Compiled from public sources — GetYourGuide's own website, press coverage and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights