2015                PhD in Atmospheric Science, Goethe University of Frankfurt am Main, 1.0 magna cum laude, Thesis advisor: Joachim Curtius

2011                MPhys, Oxford University (Exeter College)



2015 – present Cooperative Institute for Research in Environmental Sciences, CU Boulder and NOAA Earth Science Research Laboratory, Chemical Science Division, Research Scientist



Refereed Journal Articles

2016                Global atmospheric particle formation from CERN CLOUD measurements,

Dunne, E., et al., incl. Williamson, C., Science, DOI: 10.1126/science.aaf2649

2016                Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation, Gordon, H., et al., incl. Williamson, C., Proc. Natl. Acad. Sci. U.S.A, 113, 43, 12053–12058

2016                New particle formation in the free troposphere: a question of chemistry and timing, Bianchi, F., et al., incl. Williamson, C., Science, 352, 6289, 1109-1112

2016                Ion-induced nucleation of pure biogenic particles, Kirkby et al., incl. Williamson, C., Nature 533, 521–526

2016                The role of low-volatility organic compounds in initial particle growth in the atmosphere, Tröstl et al., incl. Williamson, C., Nature 533,527–531,

2016                The effect of acid–base clustering and ions on the growth of atmospheric nano-particles, Lehtipalo et al., incl. Williamson, C., Nature Communications 7: 11594

2016                Observation of viscosity transition in alpha-pinene secondary organic aerosol Järvinen, E., et al., incl. Williamson, C., Atmos. Chem. Phys., 15, 28575-28617

2016                Phase transition observations and discrimination of small cloud particles by light polarization in expansion chamber experiments, Nichman, L., et al., incl. Williamson, C., Atmos. Chem. Phys., 16, 3651-3664

2016                Aqueous phase oxidation of sulphur dioxide by ozone in cloud droplets, Hoyle, C. R., et al., incl. Williamson, C., Atmos. Chem. Phys., 16, 1693-1712

2016                Hygroscopicity of nanoparticles produced from homogeneous nucleation in CLOUD experiments, Kim, J., et al., incl. Williamson, C., Atmos. Chem. Phys., 16, 293-304

2015                Elemental composition and clustering of α-pinene oxidation products for different oxidation conditions, Praplan, A. P., et al., incl. Williamson, C., Atmos. Chem. Phys., 15, 4145-4159

2015                On the derivation of particle nucleation rates from experimental formation rates, Kürten, A., Williamson, C., Almeida, J., Kirkby, J., Curtius, J., Atmos. Chem. Phys., 15, 4063-4075

2014                Molecular measurement of neutral clusters during sulfuric acid-dimethylamine new particle formation, Kürten, A., et al., incl. Williamson, C., Proc. Natl. Acad. Sci. U.S.A, 111, 15019 – 24

2014                Insights into acid-base nucleation experiments by comparison of the chemical composition of positive, negative and neutral clusters, Bianchi, F., et al., incl. Williamson, C., Environ Sci Technol., 14 Dec 2; 48(23):13675-84

2013                Molecular understanding of sulphuric acid – amine particle nucleation in the atmosphere, Almeida, J., et al., incl. Williamson, C., Nature, 502, 359 – 363



2012-2013       Marie Curie fellowship on CLOUD-ITN

2013-2015       Marie Curie fellowship on CLOUD-TRAIN



2014                Exploring Aerosol Size Distributions below 4nm, ITM, Stockholm University

2013                Measuring Aerosols and Calculating their Climate Relevant Properties, SPOT-ITN conference, Arnhem, Netherlands

2012                An Inversion Technique for Calculating Aerosol Particle Growth Rates, CLOUD-ITN final conference, Königstein, Germany



2016                A First Look at the Global Distribution of Newly Formed Particles from the NASA Atmospheric Tomography Mission, IGAC, Breckenridge, CO, poster

2015                Calibrations of Aerosol Spectrometers linking Ground and Airborne Measurements, AGU fall meeting, San Francisco CA, poster

2015                Nucleation Mode Aerosol Spectrometer Calibrations for Fast Time-Response Tropospheric Measurements on the NASA Atmospheric Tomography Mission, AAAR, Minneapolis MN, poster

2013                A Double Inversion: Size and Time Resolved Growth Rates on CLOUD at CERN, ICNAA, Fort Collins CO, poster

2012                Aerosol Growth in the CLOUD Chamber, EAC, Granada, Spain, poster



2015 – present Measuring and analyzing aerosol size distributions on the NASA Atmospheric Tomography Mission

2012 – 2015    Measuring aerosol nucleation and growth on the CERN CLOUD chamber

Developing multi-instrument inversion techniques

2014                Secondment at California Institute of Technology with Richard Flagan on inverse modeling approaches to large data sets

2014                Measuring free tropospheric nucleation on the Jungfraujoch station



 2014                Supervision of Bachelor’s student project, Goethe University, Frankfurt

2013                Supervision of Master’s work and thesis, Goethe University, Frankfurt



2016                Manuscript review, Atmos. Chem. Phys

2017                Manuscript review, Atmos. Chem. Phys