# GLG (Gerson Lehrman Group)

> GLG (Gerson Lehrman Group) is the world's largest expert network, connecting professionals - investors, corporations, consultancies and non-profits - with a marketplace of roughly one million vetted subject-matter experts. Through one-on-one phone consultations, surveys, roundtables, site visits and custom research, GLG turns a client's questions into direct conversations with people who have first-hand knowledge, wrapped in a compliance framework designed for regulated industries. Founded in 1998 and headquartered in New York, the firm operates in more than 20 cities worldwide and generates roughly $600 million in annual revenue.

- **Founded:** 1998
- **Headquarters:** New York, New York, United States
- **Founders:** Mark Gerson (Co-Founder (Chairman)), Thomas Lehrman (Co-Founder)
- **Team size:** ~2,000-4,500 employees (sources vary); operations in 22 cities across 12 countries
- **Products:** Expert Consultations (1-on-1 calls), Surveys & Quantitative Research, Roundtables & Teleconferences, GLG Events / Live Events, Site Visits & Field Work
- **Notable:** Built the world's largest expert network with roughly one million vetted experts, Widely credited with pioneering and shaping the modern expert-network industry, Grew from a friends-and-family-funded startup to ~$600M+ in annual revenue

## Products & services

- **Expert Consultations (1-on-1 calls)** — One-on-one phone or video consultations that connect a client with a vetted expert who has first-hand knowledge of a specific market, company, technology or topic.
- **Surveys & Quantitative Research** — Custom surveys fielded across GLG's expert network to gather structured, statistically usable data from practitioners.
- **Roundtables & Teleconferences** — Moderated group discussions and events where multiple experts address a client's theme or question set.
- **GLG Events / Live Events** — In-person and virtual events, workshops and industry briefings bringing experts and clients together.
- **Site Visits & Field Work** — Facilitated visits, plant tours and field research with domain experts.
- **Custom Recruitment & Expert Placement** — Sourcing and placing specialized experts, advisors and board candidates for client-specific needs.
- **GLG Institute / Professional Learning** — Custom learning programs, executive mentorship and thought-leadership content for professional development.
- **GLG Social Impact / Pro Bono** — Program that connects social-sector organizations with GLG's expertise at no or reduced cost.

## Achievements

- Built the world's largest expert network with roughly one million vetted experts
- Widely credited with pioneering and shaping the modern expert-network industry
- Grew from a friends-and-family-funded startup to ~$600M+ in annual revenue
- Operates across 22 cities in 12 countries
- Backed by top-tier private equity including Silver Lake

## Latest updates

- **2024-07** — Gemma Postlethwaite became CEO of GLG, succeeding Paul Todd, after serving on the company's board.
- **2022-03** — GLG withdrew its planned IPO that had been filed in October 2021.
- **2021-10** — GLG filed for a US IPO seeking to raise roughly $100 million.

## Links

- Website: https://glginsights.com
- LinkedIn: https://www.linkedin.com/company/glg
- Twitter/X: https://www.twitter.com/GLG
- YouTube: https://www.youtube.com/user/GersonLehrmanGroup
- Facebook: https://www.facebook.com/gersonlehrmangroup

---

Profile page: https://yespress.io/glg
Published by YesPress — https://yespress.io
Last updated: 2026-07-14