Johnson Ko

Experience

1. Data Scientist

   ASML

   Jan 2023 — Present · Wilton, CT, US

   Outlined the AI/ML roadmap for operations, delivered high-impact POCs, and laid the foundation for team growth and future talent as the first data scientist in the manufacturing organization.• Implemented an XGBoost regression model and A* search algorithm to streamline the high-speed lens polishing process, accelerating convergence from raw blanks to qualified optical components, saving a total cycle time value of ~$350K/year.• Productized IoT sensor data and delivered Overall Equipment Effectiveness (OEE) analytics, unlocking predictive maintenance and consistent tracking of machine performance metrics (MTBF, MTTF, and utilization).• Established process mining infrastructure from scratch, building SQL-based pipelines and Celonis dashboards to surface friction points and drive improvements across manufacturing, logistics, and finance.• Reduced scrap cycle time by 2 weeks and material holding cost of ~$500K by mapping ownership across the scrap process and automating milestone reminders using custom workflows.• Segmented product families with K-means clustering and visualized cycle times using Box & Whisker plots, enabling engineers and planners to incorporate historical variability into release strategies and cycle time reviews.