Irwin Siegel Agency is the premier Program Administrator of insurance products and risk management solutions for Human and So ... cial Service Organizations. We are constantly developing new programs to meet the dynamic nature of the field. Our specialties include Developmental Disability Organizations, Addiction Treatment and Behavioral / Mental Healthcare, Youth Programs, and more. Supporting Those Who Support Others® – let us show you the difference. Irwin Siegel Agency is a series of RSG Underwriting Managers, LLC. RSG Underwriting Managers, LLC is a Delaware series limited liability company and a subsidiary of Ryan Specialty Group, LLC, specializing in underwriting management and other services for insurance products distributed through agents and brokers. In California: RSG Insurance Services, LLC License # 0E50879 © 2018 Ryan Specialty Group, LLC read more