Postdoctoral Research Fellows & Research Scientists

photo of Timothy Dallmann

Timothy Dallmann

  • Postdoctoral Research Fellow
  • Department of Mechanical Engineering
  • Advisor: Albert Presto

My research involves using the CAPS mobile laboratory and GIS analysis techniques to characterize spatial and temporal variability of air pollution in the Pittsburgh region. We aim to better understand relationships between pollution sources in the complex urban environment and human exposures.

photo of Mark Omara

Mark Omara

  • Postdoctoral Research Fellow
  • Department of Mechanical Engineering
  • Advisor: Albert Presto

My current research effort is focused on quantifying the magnitude of the emissions and leak rates of methane from shale gas activities in the Marcellus Shale. Using a mobile laboratory, real time emissions of methane are directly measured from a variety of facilities incorporating different stages of natural gas production. Additionally, we are also examining emissions of ozone-forming volatile organic carbons and air toxics from shale gas operations in the Marcellus Shale. Taken together, these research effort will help fill critical data gaps regarding atmospheric emissions associated with shale gas development in the Marcellus Shale and improve our understanding of the climate and air quality impacts of shale gas development.

photo of R Subramanian

R Subramanian

  • Research Scientist
  • Department of Mechanical Engineering
  • Advisor: Allen Robinson

Methane and black carbon (a part of soot) are two of the most important climate warming agents, after carbon dioxide. My projects include measurement of methane emission rates from the US natural gas infrastructure using tracer flux methods, and studies on combustion soot emissions and aerosol optical properties through a mix of field and lab experiments. I am also interested in personal exposure monitoring. My funding sources include the US Department of Energy, the US Environmental Protection Agency, the Environmental Defense Fund, and the Clean Air Task Force.

photo of Daniel Tkacik

Daniel Tkacik

  • Postdoctoral Research Fellow
  • Department of Mechanical Engineering
  • Advisor: Allen Robinson
  • Ph.D.: Civil & Environmental Engineering

During my Ph.D., I conducted experiments to estimate how much particulate matter—tiny airborne particles that wreak havoc on our bodies and affect our planet's climate—comes from vehicle exhaust and wood fires.

As a postdoc, a team of researchers and I are estimating how much methane (a potent greenhouse gas) is leaking from natural gas facilities around the United States.