![David Velinsky](/~/media/Images/ans/about/press-room-photos/science-experts/velinsky_david.ashx?h=150&w=125&la=en&hash=A431A3143063E5F913BAE9FB7C27AFDFAAA780BB)
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David Velinsky, PhD
VP for Science; Department Head; Professor, Department of Biodiversity, Earth & Environmental Science, Drexel University
Expertise: Fate and transport of chemical and other contaminants in water systems, especially in estuaries near urban centers.
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![Don Charles](/~/media/Images/ans/about/press-room-photos/science-experts/charles_don.ashx?la=en)
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Donald Charles, PhD
Senior Scientist, Phycology
Expertise: Ecology of freshwater diatoms and their use as indicators to assess current and past environmental conditions. Profile
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![Carol R. Collier](/~/media/Images/ans/about/press-room-photos/science-experts/carol_collier.ashx?la=en)
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Carol R. Collier, P.P., AICP
Senior Advisor for Watershed Management & Policy;
Director, Environmental Studies and Sustainability Program (ENSS), Department of Biodiversity, Earth & Environmental Science
Expertise: Experienced leader in regional watershed management and policy.
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![Marina Potapova](/~/media/Images/ans/about/press-room-photos/science-experts/potapova_marina.ashx?la=en)
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Marina Potapova, PhD
Assistant Curator, Diatoms; Assistant Professor, Department of Biodiversity, Earth & Environmental Science, Drexel University
Expertise: Ecology and taxonomy of freshwater diatoms and their use to monitor human impacts.
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![Roland Wall](/~/media/Images/ans/about/press-room-photos/science-experts/Roland_Wall_125x150.ashx?la=en)
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Roland Wall
Director, Patrick Center for the Environmental Research; Adjunct Professor, Department of Biodiversity, Earth and Environmental Science, Drexel University
Expertise: Urban Ecology, Coupled human-natural systems. Profile
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