
Our team at ANS works collaboratively to predict, track and assess how the DRWI’s conservation activities improve water quality and the diversity of stream biota in order to improve the effectiveness of DRWI efforts. We synthesize and disseminate our findings to our conservation partners using a range of interactive tools and data products and to the scientific community through our conference presentations and publications. Meet our team, below, and learn about our various roles and expertise.
Core Team

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Stefanie Kroll
Watershed Ecology Section Leader
Stefanie leads ANS’s work in the DRWI by providing scientific support to all the DRWI partners. She designs sampling to support data collection on Initiative effectiveness, coordinates all partner monitoring by leading Outcome Metrics Committees, provides support in sampling methods and data use to clusters, and shares results in technical and non-technical formats. In addition, she is working to advance our understanding of how DRWI activities contribute to restoration science.
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Lin Perez
Environmental Data Science Section Leader
Lin leads geospatial analysis and development of mapping applications to help guide and quantify impact of preservation and restoration investments made within the DRWI. Their goal is to make complex science accessible to investors and stakeholders making on the ground decisions within the Delaware River Watershed. Lin leads the Environmental Data Science (EDS) Section which specializes in watershed modeling, Application Program Interface (API) development, traditional geospatial analysis, and database management for all DRWI data. Lin co-chairs the DRWI Technical User Group, a cohort of modelers, data scientists, researchers, software developers and GIS professionals that guide and synchronize DRWI technical products and research.
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Marie Kurz
Biogeochemistry Section Leader
Marie leads ANS's efforts to evaluate how water quality responds to human stressors and the DRWI’s conservation activities. She and her team collect and analyze water chemistry samples from across the Initiative and interpret and synthesize the results into technical and non-technical communications. Marie provides support to cluster organizations in water quality monitoring and data interpretation and in focus areas planning. She also develops synergistic research projects relating to ecological function and geochemical processing in streams.
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David Keller
Fisheries Section Leader
Dave oversees DRWI fish data collection, analysis and interpretation. He leads ANS’ fish data collection and provides guidance as necessary on fish assemblage monitoring and data interpretation.
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Carol Collier
Senior Advisor for Watershed Management and Policy
Carol specializes in linkage among science, planning and policy. She works on internal strategy teams and with outside organizations and agencies to develop holistic approaches that will be useful to implementors and decision makers. She is a DRWI Initiative Steward.
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Roland Wall
Director, Patrick Center for Environmental Research
Roland supervises the Academy’s DRWI Team, oversees strategic direction and project planning, liaises with senior Academy management and the William Penn Foundation.
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Water Quality


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Marie Kurz,
Biogeochemist
Leads water chemistry data collection, analysis, and interpretation.
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Melissa Bross
Biogeochemist
Manages sample collection and analysis; Coordinates cluster samples and data.
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Tracey Curran
Biogeochemist
Collects field samples and performs chemical analyses.
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Joseph Heiczinger
Biogeochemist
Collects field samples and performs chemical analyses.
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Paul Kiry
Nutrient Lab Manager
Manages nutrient lab and performs chemical analyses.
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Bioassessment

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Stefanie Kroll,
Aquatic Ecologist
Leads watershed ecological data collection, analysis, and interpretation.
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Tanya Dapkey
Entomologist
Manages and creates data products.
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Hayley Oakland
Watershed Ecologist
Analyzes data and collects field samples.
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Mariena Hurley
Phycologist
Identifies algae, analyzes data and collects field samples.
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David Keller
Fisheries Biologist
Leads fish data collection, analysis, and interpretation.
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Allison Stoklosa
Fisheries Biologist
Coordinates fish data collection and management activities.
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Digital Tool Development and Data Management


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Lin Perez
Software Developer
Leads development of open-source mapping applications and geospatial analysis.
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Michael Campagna
Data Scientist
Specializes in hydrologic modeling, API development, database management and geospatial analysis.
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Julia Duriske
Data Scientist
Performs database management, GIS analyses and generates digital communications products.
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Planning, Policy, and Impact Tracking


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Lin Perez
Software Developer
Leads development and stakeholder adoption of project and metric tracking applications.
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Carol Collier
Watershed Management and Policy Expert
Specializes in linkages among science, planning and policy.
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Alexis Schulman
Environmental Planner and Social Scientist
Specializes in urban infrastructure, planning and policy.
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Field and Lab Support


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Amanda Chan
Field Crew Leader
Manages and leads field teams, site permissions and data.
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Danielle Odom
Macroinvertebrate Taxonomist
Collects field samples and leads field teams.
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Paul Overbeck
Fisheries Biologist
Manages lab activities and supports field surveys.
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Kathryn Longwill
Environmental Scientist
Prepares algae samples in the lab.
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Malcolm Newman
Environmental Scientist
Collects field samples.
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Kathryn Christopher
Science Communication Manager
Communicates and promotes our research.
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