Rebekka Klausen is an American chemist who is the Second Decade Society Associate Professor at Johns Hopkins University. Her research considers carbon and silicon-based nanomaterials for optoelectronic devices. She was a finalist for the 2021 Blavatnik Awards for Young Scientists.

Klausen is from Brookline, Massachusetts. She was an undergraduate student in biochemistry at Boston College. She moved to Harvard University as a graduate student, where she worked under the supervision of Eric Jacobsen and studied asymmetric Pictet–Spengler reactions.^[1][2][3] She moved to New York for postdoctoral research, joining the lab of Colin Nuckolls at Columbia University.^[1] There, she studied the conductive properties of molecules containing a 1-D chain of silicon atoms,^[4] as well as other fluorene-derivatives that can act as molecular wires.^[5]

Klausen began her independent career at Johns Hopkins University in 2013. Her research group studies organosilicon compounds, including poly(cyclosilane)s.^[6][7] Klausen initially looked to create a bottom-up fabrication process for the realization of silicon-based materials, and to develop cyclo-silane building blocks for their polymerization.^{[8][9][10][11]} Borrowing from the principles of carbon-based synthesis, Klausen has achieved precise control of the structure of silicon-based polymers.^[8] She was named as the Second Decade Society Associate Professor in 2019.^{[citation needed]} Klausen is part of the National Science Foundation Polymer Optimization Centre.^[12][13]

• 2015 United States Department of Energy Early Career Award^[8]
• 2017 Sloan Research Fellowship^[14]
• 2017 Marion Milligan Mason Award for Women in the Chemical Sciences^[15]
• 2017 Johns Hopkins University Catalyst Award^[16]
• 2018 National Science Foundation CAREER Award^[17]
• 2021 American Chemical Society Award in Pure Chemistry^[18]
• 2021 Blavatnik Award for Young Scientists^[19][20]