Ulrich "Uli" Pöschl (born 1969) is an Austrian chemist who was appointed Director of the newly founded Department of Multiphase Chemistry at the Max Planck Institute for Chemistry in Mainz, Germany on 1 October 2012.
Ulrich Pöschl studied chemistry at the Graz University of Technology in Austria and obtained his PhD in 1995 with Karl Hassler at the Institute of Inorganic Chemistry with a thesis on "Synthesis, Spectroscopy and Structure of selectively functionalized cyclosilanes ". From 1996 to 1997 he worked as a postdoctoral fellow at the Massachusetts Institute of Technology, Cambridge, Massachusetts, in the group of Mario J. Molina in the field of atmospheric chemical kinetics and mass spectrometry of sulfuric acid. In 1997 Pöschl became a research assistant at the Max Planck Institute for Chemistry in the Department of Atmospheric Chemistry and a researcher in the group of Paul Crutzen on the photochemistry of ozone, organic trace gases and stratospheric clouds. From 1999 to 2005 he worked at the Institute for Hydrochemistry of the Munich Technical University, led an independent research group and became a chemistry professor with a thesis on "Carbonaceous Aerosol Composition, Reactivity and Water Interactions". In 2005 he returned to the Max Planck Institute for Chemistry in Mainz and headed a research group in the Department of Biogeochemistry until 2012. Since 2007 Pöschl has also taught in the Department of Chemistry, Pharmacy and Earth Sciences at Johannes Gutenberg University in Mainz.
The Earth System and climate research are the main focus of the department in the investigation of biological and organic aerosols, aerosol-cloud interactions and atmosphere-surface exchange processes. The food and health sciences area studies how air pollutants cause changes in protein macromolecules and how this affects allergic reactions and diseases. The sequence of multiphase processes at the molecular level and its impact on the macroscopic and global scale is also investigated. The challenge lies in bridging different spatial and temporal scales: from tenths of nanometers to thousands of kilometers and from nanoseconds to years.
Pöschl is also the founder and chief executive editor of Atmospheric Chemistry and Physics (ACP), an open access peer-reviewed scientific journal published by the European Geosciences Union (EGU). It covers research on the Earth's atmosphere and the underlying chemical and physical processes, including the altitude range from the land and ocean surface up to the turbopause, including the troposphere, stratosphere, and mesosphere. Founded in 2001 as the world's first scientific journal with public peer review and discussion, it has become one of the major environmental and earth sciences journal. Pöschl is also a council member of the EGU, and he has been the Chair of the EGU Publication Committee.
- 2005: EGU Union Service Award 
- 2012: Pius XI Gold Medal  of the Pontifical Academy of Sciences for his research on the role of chemistry in the atmosphere, climate and health.