SIGMA LAMBDA GAMMA NATIONAL SORORITY, INC. NATIONAL HEADQUARTERS Sigma Lambda Gamma National Sorority, Inc. Headquarters 900 West Penn St . North Liberty , IA 52242 Office Phone (319) 626 - 7679 Office Fax (319) 626 - 7688 NATIONAL WEBSITE www.SigmaLambdaGamma.com Executive Director Mary Peterson Associate Executive Director James R. Trigilio