Member, Addiction, Treatment and Recovery Caucus
Member, Alzheimer's Disease Congressional Task Force
Member, Americans Abroad Caucus
Member, Biomedical Research Caucus
Member, Bipartisan Congressional Refugee Caucus
Member, Bipartisan Disabilities Caucus
Member, Bipartisan Pro-Choice Caucus
Member, Cancer Caucus
Member, Coalition on Autism Research and Education
Member, Community College Caucus
Member, Congressional Arts Caucus
Member, Congressional Biotechnology Caucus
Member, Congressional Boating Caucus
Member, Congressional Brain Injury Task Force
Member, Congressional Brazil Caucus
Member, Congressional Caucus on Armenian Issues
Member, Congressional Caucus on Central America
Co-Chair, Congressional Caucus on Community Health Centers
Co-Founder, Congressional Caucus on Community Health Centers
Co-Chair, Congressional Caucus on Empowerment Zones and Empowered Communities
Member, Congressional Caucus on Hellenic Issues
Member, Congressional Caucus on India and Indian Affairs
Co-Chair, Congressional Caucus on Korea
Co-Founder, Congressional Caucus on Korea
Co-Chair, Congressional Caucus on Sudan
Co-Founder, Congressional Caucus on Sudan
Member, Congressional Caucus on The Netherlands
Member, Congressional Chronic Obstructive Pulmonary Disease Caucus
Member, Congressional Climate Caucus
Member, Congressional Coalition on Adoption
Member, Congressional Cystic Fibrosis Caucus
Member, Congressional Diabetes Caucus
Member, Congressional Fire Services Caucus
Member, Congressional Friends of Animals Caucus
Co-Chair, Congressional Former Mayors Caucus
Co-Founder, Congressional Former Mayors Caucus
Member, Congressional Human Rights Caucus
Member, Congressional Humanities Caucus
Member, Congressional Internet Caucus
Member, Congressional Kidney Caucus
Member, Congressional Labor and Working Families Caucus
Member, Congressional Mental Health Caucus
Member, Congressional Mentoring Caucus
Member, Congressional Missing and Exploited Children's Caucus
Member, Congressional Port Security Caucus
Member, Congressional Progressive Caucus
Member, Congressional Task Force on International HIV/AIDS
Member, Congressional Travel and Tourism Caucus
Member, Congressional TRIO Caucus
Member, Congressional Vision Caucus
Member, Congressional Wildlife Refuge Caucus
Member, Friends of the Jobs Corps Caucus
Member, Historic Preservation Caucus
Member, House Hunger Caucus
Member, House Nursing Caucus
Member, House Science, Technology, Engineering, and Mathematics (STEM) Education Caucus
Member, International Workers Rights Caucus
Member, National Guard and Reserve Components Caucus
Member, National Service Congressional Caucus
Member, Navy-Marine Corps Caucus
Member, Northeast-Midwest Congressional Coalition
Member, Oil and National Security Caucus
Member, Open Space Caucus
Member, Out of Iraq Caucus
Member, Patriot Act Reform Caucus
Member, Public Broadcasting Caucus
Member, Qatari-American Economic Strategic Defense, Culture, and Educational Partnership Caucus
Member, Renewable Energy and Energy Efficiency Caucus
Member, Research and Development Caucus
Member, Revitalizing Older Cities Task Force
Chair, Special Task Force on Ethics Enforcement
Member, Urban Caucus

President, Massachusetts Municipal Association, 1998
Member, Massachusetts State Bar, 1977
Former President, Massachusetts Mayors' Association