Annette Koo is a New Zealand physicist who is Director of the International Bureau of Weights and Measures.
Koo received a Ph.D. from the Victoria University of Wellington in 2005 for investigations of the optoelectronic properties of gallium nitride films.
After three years in Melbourne as a postdoctoral fellow at the CSIRO and Monash University, Koo returned to New Zealand in 2008 as a research scientist at the Measurement Standards Laboratory of New Zealand, becoming Chief Metrologist in 2021 and its Director in 2022.
Her specialized research focus was on quantum metrology, specifically the measurement of light and how light interacts with materials.
In 2026, Koo became the first woman and the first New Zealander to hold the Director role at the International Bureau of Weights and Measures.
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