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The GLG (Gerson Lehrman Group) expert network was founded in 1998 and is today the world’s largest expert network. It pioneered the industry and holds a significant market share. However, recent growth has been slower, and it has been losing market share to new entrants.

When GLG started, experts were recruited “offline”, at fairs and events. Their expert network was a good phone directory, but nowhere close to the wealth of information stored in today’s browsable databases. GLG has experimented with many interesting business areas over the years. These include:

  • The 2008 collaboration with Credit Suisse. GLG offered access to the bank’s analysts, but this was later shut down.
  • The 2010 partnership with Bloomberg, later shut down.
  • The 2011 Q&A website Gplus/GLG High table, shut down in 2013.
  • The 2014 GLG Share, offering expert calls for entrepreneurs. No longer active.
  • The 2016 GLG Law, offering expert witness services (experts are brought in on litigation cases). Still active.

However, the 1h expert phone call has remained their core value proposition, according to former executives.

Major milestones for GLG:


Further reading

GLG has evolved significantly over time. We discuss the emergence and history of GLG in our history of the expert network industry. Furthermore, a senior expert shared colorful insights on the expert networks’ evolution in this piece.

Finally, here’s GLG’s website.