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Timothy S. Gehan has extensive work experience in the field of research and development. Timothy S.'smost recent role was as the Head of Research and Development at Tandem PV since August 2022. Prior to that, they worked at Tandem PV as a Senior Research Chemist and Site Lead from September 2019 to July 2022, and as a Research Chemist from April 2019 to August 2019.

Before joining Tandem PV, Gehan worked as a Postdoctoral Researcher at the National Renewable Energy Laboratory from July 2018 to April 2019. Timothy S. also served as a Postdoctoral Fellow at the Colorado School of Mines from August 2017 to July 2018.

Gehan's academic background includes a Ph.D. in Organic Materials Chemistry from the University of Massachusetts Amherst, where they were a Ph.D. Student from September 2010 to August 2015. Timothy S. also held the position of Manning Inventor Postdoctoral Fellow at the University from September 2015 to September 2016.

Additionally, Gehan gained industry experience as a Downstream Processing Intern at Regeneron Pharmaceuticals from May 2010 to August 2010, and as an Undergraduate Researcher at Rensselaer Polytechnic Institute from September 2009 to August 2010.

Earlier in their career, Gehan worked as a Downstream Processing Intern at Regeneron Pharmaceuticals from May 2009 to August 2009. Timothy S. also served as a Siena Summer Scholar in Chemistry at Siena College from May 2008 to August 2008, and as an Environmental Health and Safety Department Assistant at Goodrich ISR Systems from May 2007 to August 2007.

Timothy S. Gehan obtained their Bachelor of Science degree in Chemistry (ACS Certified) from Siena College in 2008. Timothy S. then pursued further education at Rensselaer Polytechnic Institute, where they earned a Bachelor of Science degree in Chemical Engineering, which they completed in 2010. Following this, Timothy S. Gehan attended the University of Massachusetts Amherst from 2010 to 2015, where they obtained a Doctor of Philosophy (Ph.D.) in Organic Materials Chemistry.