Spectrum Equity acquired a 50% stake in Expert Institute Group, a provider of expert witness recruitment services for law firms. Financial terms were not disclosed. Mike Farrell from Spectrum Equity, said, "TEI has filled a much-needed void in the market, providing a unique and highly valuable service to leading law firms by streamlining the historically disjointed and unstructured process of finding expert witnesses. TEI is uniquely positioned to continue to serve its customers through a highly differentiated and cost-effective service. We are thrilled to partner with Michael Talve and the rest of the TEI team as they continue to provide a world-class service to leading law firms."