Brett Gibson

Who they are

Brett Gibson is Managing Partner at Initialized Capital — co-founded Posterous, the blogging-by-email service acquired by Twitter, and still runs Posthaven, the scrappy successor platform he launched in 2013.

Person

Brett started as a builder: Drew Here in 2005 (a browser drawing tool acquired by DeviantArt), then Slinkset in 2008 (a YC-funded community platform he later folded into Posterous), then Posterous itself in 2009 — a dead-simple blogging-by-email service that Twitter acquired. After that exit he didn't pivot to VC immediately; he spent time at Grand Central Communications and Sonific as a developer, did a stint at Y Combinator on the software side (2014–2015), and eventually joined Initialized Capital in May 2017 as Partner, rising to General Partner by 2020. He's also a co-founder of NextGen Venture Partners, a network-driven venture firm, and co-founded the playfully named Occasional Good Idea Co. The through-line is a founder who never fully stopped building — he's still running Posthaven, a deliberately simple blogging platform, and writes on it. He holds a BA from UC Santa Barbara. He spoke at the AI Agent Conference 2026 in New York City, and writes at both blog.posthaven.com and blog.initialized.com on venture capital, early-stage startups, and publishing platforms.

How they likely show up

Serial founder track (DrawHere → Slinkset → Posterous → Posthaven → Occasional Good Idea Co.) alongside a VC career → he thinks like an operator, not a pure capital allocator.
Still actively running Posthaven years after founding it → high follow-through; doesn't abandon projects easily.
Moved from software engineer/developer roles into venture → likely evaluates technical bets from first principles, not just market maps.
Active public writer across both Posthaven and the Initialized blog, with content themes around early-stage investing and technology → comfortable articulating theses in writing, probably more precise in written form than in casual conversation.
Speaking at AI Agent Conference 2026 → actively engaging with the current AI agent wave, not just watching from the sidelines.
Tenure at Initialized spans Partner → GP → Managing Partner over ~5 years → patient climber within an institution, not a serial job-hopper on the VC side.

Conversation tips

→ Reference a specific Posthaven post or Initialized blog post by topic — he writes to think, and he'll know immediately whether you read it or just skimmed headlines.
→ Bring a concrete technical question about whatever you're building — he was a working engineer before he was a VC and will engage at that level.
→ Ask about the AI agent space directly; he was on stage at the AI Agent Conference in 2026, so he has a formed view worth pulling on.
→ Don't treat him as a pure financier — the Posterous and Posthaven backstory matters to him and signals his operating identity.

Toolbox

Openers

Open on Posthaven — he's been running a deliberately simple blogging platform since 2013, over a decade after Twitter acquired Posterous, which makes a pointed statement about what he thinks the internet should look like.
Reference his appearance at AI Agent Conference 2026 in New York City — he's publicly on record engaging with AI agents, so leading there signals you've tracked his current thinking, not just his bio.
Mention the Slinkset → Posterous arc — a YC-funded startup he folded into his own next company is an unusual move that shows early conviction about consolidating rather than selling.

Discovery questions

You went from building Posterous to backing founders at Initialized — what do you notice founders get wrong about distribution that you learned the hard way with Posterous?
Posthaven has been running since 2013 as a simple, stable platform — what does that teach you about what early-stage startups over-optimize for?
You spoke at the AI Agent Conference this year — where in the agent stack do you think the durable, fundable companies actually get built?

Avoid

Don't treat the Posterous acquisition by Twitter as his defining credential and leave it there — he's built four other companies since and will find it reductive.

Make it yours