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Join VSA Today. Membership in VSA includes a range of resources and professional development opportunities that provide you with access to current research in the field professional learning opportunities for any stage of your career and a network of some of the fields most forward thinking professionals. Learn More Denver Museum of Nature and Science Professional Development Offerings VSA is committed to offering yearround Professional Development PD opportunities for its members and other individuals looking to further their professional expertise in the field of visitor studies. Learn More Denver Museum of Nature and Science Support Young Professionals.