Meet Our Team

United by a desire to provide the highest value to our clients.



Jeffrey Rosen - CEO

Jeffrey S. Rosen is the CEO of Corona Environmental Consulting, LLC. He is a Senior Scientist and Statistician with over thirty years of experience in conducting environmental research. His career has focused on processing data into useful information to support effective environmental management. 
    Jeff has worked on a wide range of topics including regulation development, on-line monitoring, homeland security and information system development, and helped support legal teams in complex environmental litigation. In doing this work, Jeff has led multi-disciplinary teams to capture, quality control and analyze data, and designed and performed complex statistical analyses.
    Jeff holds M.S. degrees in oceanography and statistics from the University of Rhode Island, and a B.S. in biology from the University at Albany, SUNY.


Chad Seidel - President

Dr. Chad Seidel is a recognized drinking water quality and treatment leader, and a Registered Professional Engineer in Colorado. His years of consulting experience in the drinking water community have focused on surface water treatment, including microbial pathogens and disinfection byproduct (DBP) minimization, groundwater and inorganic contaminant treatment, and regulatory and policy research.
   Chad has a diverse range of experience providing large and small drinking water utilities with process and design engineering services, from optimization of existing conventional treatment processes to the application of advanced treatment processes for controlling emerging contaminants. 
   Chad  holds a Ph.D. and M.S. in civil and environmental engineering from the University of Colorado at Boulder and a B.S. in environmental engineering from Montana Tech.

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Ayhan Ergul - Vice President

Ayhan Ergul has supported many drinking water utilities and government agencies in the areas of software development, data management, information systems, GIS and metadata management. He has developed decision support tools and provided technical assistance for drinking water regulation, environmental decision making and environmental litigation.
   Ayhan specializes in the development of tools, processes, and quality assurance procedures for high accuracy and robust processing of data.
   Ayhan holds a M.Sc. in computer engineering from Orta Doğu Teknik Üniversitesi and a M.Sc. in computer science from Northeastern University.


Jennifer Aieta - Director of Engineering

Jennifer Aieta has over 30 years of experience in environmental and civil engineering, having served as project manager and project engineer in many multi-discipline projects. Ms. Aieta was named the National Society of Professional Engineers Colorado 2014 Woman Engineer of the Year. Her project experience and technical expertise include ground and surface water treatment plant design, desalination plant design, water treatment feasibility studies, equipment pre-procurement, chemical storage and feed systems, pilot water treatment system design and operation, cost development and validation, civil and site design, and bid procurement preparation.  Ms. Aieta is a registered Professional Engineer in California and Colorado.

Science and Engineering Team


Timothy Bartrand

Environmental Engineer


Jennifer Benjamin

Data Analyst


Jake Causey

Senior Water Quality
& Treatment Engineer


Tod Chee

Program Manager


Amlan Ghosh

Environmental Engineer


Craig Gorman

Environmental Engineer


Tarrah Henrie

Environmental Scientist


Margaret Kearns

Environmental Scientist

Sheldon Vaughn Masters, Civil Engineering

Sheldon Masters

Environmental Scientist and Engineer


Adam McKeagney

Data Analyst


Carleigh Samson

Environmental Engineer


Emily Smith

Research Scientist

GIS and IT Team


Josh Coefer

GIS Project Manager


Jon Janezic

Business Systems and IT Manager


Jessica Zichichi

GIS and Metadata Consultant

Water Sector Economists


Janet Clements

Senior Economist


James Henderson

Senior Water Resources Economist

Karen Raucher

Karen Raucher

Policy and Communication Strategist


Robert Raucher

Director of Water Economics

Business Development and Administrative Team


Karen Gummer

Executive Administrative Assistant


Denise McDonough



Annemarie Naughton