New York State Psychological Association promotes mental health by educating the general public and health care professionals, and by providing public service projects to the community. Membership: 3,000

American Institute of Architects created to promote communication among all members of the design and construction team, individual allied membership is open to engineers, planners, landscape architects, sculptors, muralists, artists, and those in government, education, journalism, manufacturing industry, and other fields allied to architecture. Membership: 64,000

American Institute of Certified Public Accountants provides members with the resources, information, and leadership that enable them to provide valuable services in the highest professional manner to benefit the public as well as employers and clients. Membership: 330,000

Institute of Electrical and Electronic Engineers promoting the engineering process of creating, developing, integrating, sharing, and applying knowledge about electrical and information technologies and sciences for the benefit of humanity and the profession. Membership: 350,000

American Speech-Language-Hearing Association professional, scientific, and credentialing association for more than 99,000 audiologists, speech-language pathologists, and speech, language, and hearing scientists. Ensures that all people with speech, language, and hearing disorders have access to quality services to help them communicate more effectively. Membership: 99,000

American Society of Civil Engineers provides essential value to our members, their careers, our partners and the public by developing leadership, advancing technology, advocating lifelong learning and promoting the profession. Membership: 123,000

American Institute of Chemical Engineers home of the Lifetime Center for professional & personal growth, and security of chemical engineers, and the Foremost Catalyst in applying chemical engineering expertise in meeting societal needs. Membership: 50,000

Special Libraries Association leading professional association in the information industry; puts knowledge to work for the benefit of decision-makers in corporations, government, the professions, and society; as well as to shape the destiny of our information and knowledge-based society. Membership: 15,000

American Society of Landscape Architects services include a national annual meeting and EXPO, Landscape Architecture magazine, Landscape Architecture News Digest, on-line electronic services, professional workshops and seminars, leadership training, employment referral, demonstration projects, and awards program. Membership: 12,000

Mortgage Banker Association of America representing the real estate finance industry. MBA serves its membership by representing their legislative and regulatory interests before the United States Congress and federal agencies; by meeting their educational needs through programs and a range of periodicals and publications; and by supporting their business interests with a variety of research initiatives and other products and services. Membership: 3,200

American Pharmaceutical Association provides professional information and education for pharmacists and advocates improved health of the American public through the provision of comprehensive pharmaceutical care. Membership: 50,000

American Nurses Association fosters high standards of nursing practice, promotes the economic and general welfare of nurses in the workplace, projects a positive and realistic view of nursing, and lobbies Congress and regulatory agencies on health care issues affecting nurses and the general public. Membership: 180,000