GLG's leadership is male and white. There are only a handful of minorities that work there and choose to stay more than a year. There are no minorities in senior leadership in the US. Many women can be found in junior roles, but only a tiny fraction make it to the executive level.
The work is repetitive and doesn't translate into hard skills. As other reviewers noted, you can learn how to do this job in 6 months and get good at it by a year. If you stay more than 2 years you make yourself less employable by the minute. The focus on hard metrics is too extreme and makes it feel like a call center. GLG started emphasizing L & D to address some of the negative feedback about lack of professional development, but all I saw was a chance to sit through an advanced Excel lecture.
They have an employee survey every year that is supposed to be anonymous but really isn't. To anyone currently at GLG, be very careful about how you respond as your manager (and above) can slice the data real thin to see who said what.