Current MeMBERS
Peter DeCarlo, Ph.D. Professor of Environmental Health and Engineering
Ph.D. in Atmospheric Science, 2007 University of Colorado
Research Interests: Using a mixture of research instrumentation and lower cost sensors to measure the chemical composition of particulates and gases in indoors, outdoors, and in the laboratory to better understand the intersection between energy, air quality, health, and climate impacts of human emissions.
Email: pdecarl1@jhu.edu
Twitter: @ProfPeteD
Benjamin Nault, Ph.D. Associate Research Professor of Environmental Health and Engineering
CU Postdoc in Chemistry, focusing on urban aerosol sources and chemistry to remote aerosol chemistry
Ph.D. in Earth and Planetary Science, 2015 – University of California, Berkeley, Department of Earth and Planetary Sciences
B.S. in Chemistry (ACS) – Purdue University, Department of Chemistry (ACS accredited)
Research Interests: Instrumental development to investigate the sources and chemistry of gas-and particle-phase pollutants and how they impact air quality and communities.
Email: bnault1@jhu.edu
Twitter: @Benjamin_AtmChm
Research scientists and engineers
Ben Werden, Ph.D. Assistant Research Scientist
Postdoc at Aerodyne Research, Inc., focusing on cloud aerosol seeding and mobile measurements
Ph.D. in Chemistry, 2020 – Drexel University
B.S. in Computer Engineering – Binghamton University
Research Interests: Instrumental development to investigate the sources and chemistry of gas-and particle-phase pollutants and how they impact air quality and communities.
Email: BenWerden@jhu.edu
Postdoctoral Researchers
Daniel Blomdahl, Ph.D.
Ph.D. in Civil Engineering, 2024 – University of Texas at Austin, Department of Civil, Architectural and Environmental Engineering
B.S. in Engineering Physics, 2019 – Whitworth University
Research Interests: Mobile measurements of hazardous air pollutants and other VOCs relevant to atmospheric chemistry. Method development of mass spectrometry techniques to improve detection of gas-phase compounds.
Email: dblomda1@jh.edu
Nahin Ferdousi-Rokib, Ph.D.
Ph.D. in Chemical Engineering, 2025 – University of Maryland – College Park, Department of Chemical and Biomolecular Engineering
B.S. in Chemical Engineering, 2019 – Lafayette College, Department of Chemical and Biomolecular Engineering
Research Interests: Mobile and stationary measurements of particulate matter to measure aerosol concentration, chemical composition, and their sources. Investigating how pollutants influence air quality across regions and local impact on communities.
Email: nferdou1@jh.edu
Caroline Frischmon, Ph.D.
Ph.D. in Mechanical Engineering, 2026 – University of Colorado – Boulder, Department of Mechanical Engineering
B.S. in Bioproducts and Biosystems Engineering, 2020 – University of Minnesota – Twin Cities, Department of Bioproducts and Biosystems Engineering
Research Interests: Community-based, participatory air monitoring to investigate disparate impacts in industrialized communities, especially using low-cost sensor networks.
Email: cfrisch4@jh.edu
Madeline Miles, Ph.D.
Ph.D. in Environmental Science, 2024 – University of Virginia, Department of Environmental Sciences
B.S. in Chemistry, 2019- Appalachian State University, Department of Chemistry
Research Interests: atmospheric trace gas exchange, nitrogen oxide emissions, air pollution inequality, satellite observations of trace gases.
Email: mmiles26@jh.edu
Oladayo Oladeji, Ph.D.
Ph.D. in Mechanical Engineering, 2025 – Carnegie Mellon University, Department of Mechanical Engineering
M.S. in Mechanical Engineering, 2021 – Montana State University, Department of Mechanical & Industrial Engineering
B.S. in Mechanical Engineering, 2016 – University of Ibadan, Department of Mechanical Engineering
Research Interests: Urban Air Quality and Hazardous Air Pollutants, using advanced mass spectrometry techniques such as the Aerosol Mass Spectrometer(AMS), Gas Chromatography Mass Spectrometer (GC-MS), and the Proton Transfer Reaction Mass Spectrometry(PTR-MS) with a particular focus on spatial Analysis, source apportionment, and linking emissions to human health and environmental risks, including applications in post-disaster and community exposure assessments
Email: ooladej5@jh.edu
Graduate Students
Amira Yassine, MSc, Ph.D. Candidate
Research Interests: Study of atmospheric air pollution resulting from industrial emissions with a focus on metals and volatile organic compounds. Assess the impact of these industrial emissions on the health of the communities living next to the industrial facilities.
Email: ayassin2@jhu.edu
Keelie Steiner, Ph.D. Student
B.S., Major in Meteorology, Minors in Emergency Management and Mathematics, 2024 – Millersville University
Research Interests: Understanding differences in VOC measurements based on meteorological conditions; Working with lower-cost air quality sensors to enhance understanding of how these sensors operate and are useful for studying particulate matter and various gases
Email: ksteine6@jh.edu
Alec Pirone, Ph.D. Student
B.S.E., Major in Environmental Engineering, Minor in Applied and Computational Mathematics, 2024 – Princeton University
Research interests: Behavior and composition of atmospheric particulate matter and environmental risk assessment.
Email: apirone2@jh.edu
Mohammed Kemal, D.Eng. Student
M.S. in Computer Science, Johns Hopkins University
M.B.A with a focus in information systems & business analytics, University of Maryland – College Park
M.P.S. in Geospatial Information Sciences, University of Maryland – College Park
B.S., Major in Geographic Information Systems, Minor in Global Poverty, University of Maryland – College Park
Research interests: Applying AI and geospatial analysis to monitor environmental change, detect anomalies, and support public health and humanitarian decision making.
Email: mkemal1@jhu.edu
Paul Moon, Ph.D. Student
B.S., Major in Environmental Engineering, 2024 – Yale UniversityResearch interests: Study of Hazardous Air Pollutants using machine learning techniques and their health impacts on communities living near facilities.
Email: pmoon1@jh.edu
Austin Turner, Ph.D. Student
B.S., Majors in Geology and Chemistry, 2022 – University of Texas, Austin
Email: aturne62@jh.edu
Alumni
Xinxiu Tian, Ph.D., M.A.Sc
Twitter: @TianXinxiu
Maya Savory, M.S.E, B.S.
Lalitha Aiyar, M.S.E, B.S.
Joey Stanley, M.S.E, B.S.
Melina Krawchick, M.S.E, B.S.
Adriana Peña, M.S.E
Ellis Robinson, Ph.D.
Mina Tehrani, Ph.D., MPH
Twitter: @MinaTehrani5
Shivang Agarwal, M.S.
Twitter: @ShivangAgarwal_
Tianyi Li
Henry Colby