Roselle Visaya is currently the Associate Director and Analytical Lead at Bayer, a position held since 2025. Previously, they served as a Staff Development Scientist at Bayer from 2020 to 2025 and held roles such as Sr. Associate Development Scientist and Development Scientist at Bayer Pharmaceuticals between 2013 and 2017. Roselle also accumulated experience as a Lab Analyst II at Novartis Vaccines and Diagnostics and as an LCMS Product Specialist at Hitachi High Technologies America. Earlier in their career, they worked at Malvern Instruments in GPC and Separations Product Support and conducted postgraduate research at UC Davis.
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