Alex Taussig

Who they are

Alex Taussig is a Partner at Lightspeed Venture Partners — writes the 'Firehose' newsletter on Substack covering venture capital, consumer tech, and Latin American markets, and sits on the board of United Rentals (NYSE: URI).

Person

Alex joined Lightspeed in 2016, when it was already an established multi-stage firm. Before that he was a Partner at Highland Capital Partners, where he cut his teeth on early-stage investing. He went to Harvard Business School, which also brought him back as a speaker at the 30th anniversary VCPE Conference in 2024. His investing focus spans enterprise software, SaaS, AI, and consumer marketplaces — and he's put real effort into the Latin American market, speaking at South Summit Brazil in 2024 and covering the region in his writing. He runs 'Firehose,' an active Substack and Medium presence where he publishes on venture capital mechanics, marketplace dynamics, and retail tech — practical, not theoretical. He co-authored 'The Ultimate Guide to Scaling Marketplaces' with Vinted CEO Thomas Plantenga, which signals he works closely with operators, not just at a distance. The through-line: a career built around pattern-matching across software, marketplaces, and global consumer tech, with a public voice to match.

Company

Lightspeed Venture Partners led the $300 million Series B round for AI chip startup Ricursive Intelligence in January 2026 and led Ramp's $300 million raise at a $32 billion valuation in May 2026 — two high-profile bets that mark the firm's current conviction in AI infrastructure and fintech. At the firm level, Lightspeed has publicly articulated a global opportunity thesis, with 65% of C-level executives in their research agreeing that regulation and geopolitical pressure will drive industry consolidation rather than hinder it. The firm operates across multiple geographies and stages, with partners including Amy Wu, Paul Murphy, and Jeremy Liew.

Market

Lightspeed Venture Partners operates in the multi-stage venture capital market, competing for deals across consumer tech, enterprise software, AI, and fintech against other large multi-stage firms. The firm's current public thesis centres on geopolitical regionalization and regulatory consolidation as structural tailwinds — a view that shapes where it deploys capital globally, including in Latin America and across AI infrastructure.

Network

Taussig's closest named colleagues at Lightspeed are Amy Wu, Paul Murphy, and Jeremy Liew, all co-General Partners at the firm. His most notable external operator relationship is with Thomas Plantenga, CEO of Vinted, with whom he co-authored and co-presented a guide on scaling marketplaces.

Amy Wu· co-General Partner at Lightspeed Venture Partners
Paul Murphy· co-General Partner at Lightspeed Venture Partners
Jeremy Liew· co-General Partner at Lightspeed Venture Partners
Thomas Plantenga· CEO at Vinted

How they likely show up

Active Substack and Medium writing on venture mechanics and marketplaces → he processes and publishes his thinking publicly, so he's likely done the intellectual work before a meeting starts.
Co-authored 'The Ultimate Guide to Scaling Marketplaces' with an operator (Vinted's CEO) → he gravitates toward practitioner collaboration, not just top-down analysis.
Possibly — long tenure at Lightspeed since 2016 → likely thinks in fund cycles and multi-year company arcs rather than short-term deal metrics.
Speaker at Harvard Business School VCPE and South Summit Brazil in the same year → comfortable in both institutional academic settings and emerging-market operator forums; range suggests he adapts his frame to the audience.
Independent Director at United Rentals (NYSE: URI) alongside his VC role → he holds board-level accountability in a public company context, which means he's fluent in governance, not just growth.
Coverage of Latin American markets in his newsletter → has a developed view on emerging market dynamics that goes beyond the standard US-centric VC lens.

Conversation tips

→ Reference a specific 'Firehose' post or his marketplace guide with Plantenga — he'll know immediately whether you've read his work or are faking it.
→ Ask about Latin America specifically; it's a deliberate focus, not a passing interest, and he's unlikely to get that question from most people he meets.
→ Engage him on the board director side — his United Rentals role is a distinct layer of his identity that most VC conversations skip.
→ Come with an operator perspective or a specific company example; his co-authorship with Plantenga suggests he values founder/operator grounding over abstract frameworks.
→ Don't treat him as a generalist — he has stated views on marketplaces, SaaS, and AI; engage those specifically rather than asking broad 'what are you excited about' openers.

Toolbox

Openers

Open on 'The Ultimate Guide to Scaling Marketplaces' — he co-authored it with Vinted CEO Thomas Plantenga, which is an unusual VC-operator collaboration worth unpacking for what it reveals about how he thinks about his portfolio relationships.
Reference the Ramp round — Lightspeed led the $300 million raise at a $32 billion valuation in May 2026, which is a significant fintech bet to lead right now and a natural entry point into how he's thinking about embedded finance and payments.
Bring up his Latin America coverage in 'Firehose' — he spoke at South Summit Brazil in 2024 and writes about the region regularly, making it a differentiating thread in his work that most US VC conversations ignore.

Discovery questions

The marketplace guide with Thomas Plantenga — what did working with an operator at that scale change about how you evaluate marketplace businesses at the early stage?
You've been writing about Latin American markets for a while — what's the structural shift that made the region worth sustained attention rather than opportunistic bets?
Sitting on the United Rentals board alongside a VC role is an unusual combination — how does that public-company governance lens change how you advise private portfolio companies?

Avoid

Don't ask generic 'what's your investment thesis' questions — he has published his views extensively on Substack and Medium, and arriving without having read them signals you haven't done the work.

Make it yours