Meet The Startup Building AI For The Messiest Part of Law

“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 [email protected]

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