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Ryan Specialty Group has completed its acquisition of of the Irwin Siegel Agency Inc. (ISA), a leading human and social service managing general underwriter and is based in Rock Hill, N.Y. Its specialties include Developmental Disability Organizations, Addiction Treatment and Behavioral/Mental Healthcare, Youth Programs and more.  

ISA’s operations will become part of RSG Underwriting Managers, the managing general underwriting division of Ryan Specialty Group.

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