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Meet The Startup Building AI For The Messiest Part of Law

Gregory Mostyn on building the litigation tool Big Law actually wanted

“Crack the chronology, crack the case.”

That’s what Gregory Mostyn‘s father - a barrister, then judge for 42 years - was told on his first day in chambers.

Decades later, it’s the founding insight behind Wexler.

I spoke with Gregory Mostyn, co-founder and CEO of Wexler, the fact intelligence platform now used by huge massive circle firms in their litigation teams.

Greg isn’t a lawyer. He grew up watching his father - who handled some of the highest-profile family cases in England - come home with ten ring binders to read before court the next morning. That image, plus a stint at Entrepreneur First, became Wexler. The company has 20x’d ARR since pre-seed and just raised $5.3m led by Pear VC.

We discussed:

→ Why Wexler went deep on litigation when every other legal AI startup was going broad

→ The “verification tax” and where fully agentic legal AI actually breaks down

→ Why consumption pricing beats per-seat for litigation work (and how they structure it)

→ How his 67-year-old father is now vibe-coding apps for his tennis club

→ What it takes to close a Big Law deal in a week

I absolutely loved recording this episode and I hope you enjoy listening to it just as much as I did.

Know someone that might want to come on the Best Practice Podcast? Email me at george@georgehannah.com

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