Dan Hellfeld Email & Phone Number

San Diego, Ca, Us

Cupertino, California, Us

Algorithm development in the Vision Products Group.

Berkeley, Ca, Us

◦ Designed, proposed and successfully acquired federal funding to apply machine learning techniques to 3D event data in gamma-ray detectors used for international nuclear safeguards.Led the project and managed a team of four engineers. [Python, ROS]◦ Devised a novel differential maximum-likelihood-based image reconstruction algorithm to sup-press spatially-varying background and improve image quantitation. [Python, OpenCL]◦ Developed a simulation software stack for sUAS-borne detectors and implemented a behavior tree model for autonomous surveys and source localization. [Python, C++, ROS, Gazebo, Docker]

Berkeley, Ca, Us

◦ Developed and deployed quantitative real-time 3D mapping and point-source localization algorithms on several custom prototype systems with successful technology demonstration tosponsors. [Python, ROS, OpenCL, Docker, K8s]◦ Implemented object detection and tracking in lidar and fused 3D tracks with radiation datastreams (static and mobile) to improve real-time radiological source detection and attribution.[Python, C++, ROS, PyTorch, TensorRT, ONNX, CUDA]◦ Established a graph-based simulation framework for sparse radiation sensor networks in urbanenvironments using high-fidelity map and time-series routing data. [Python]

◦ Led the low-energy imaging algorithm development for the fusion of vision sensors (e.g., RGB-D, lidar) and computer vision techniques (e.g., SLAM, photogrammetry) with platform-agnostic gamma-ray imagers. Performed the first experimental demonstration of near-real-time omni-directional 3D active-coded-mask imaging. [Python, C++, ROS, OpenCL/GL, Javascript]◦ Devised a sparse parametric 3D imaging algorithm (multi-objective optimization) formultiple point-source localization with free-moving radiation detectors. [Python, OpenCL]

Livermore, Ca, Us

Developed a detailed antineutrino-electron scattering background model in a deep underground water-based detector and studied the impact of overburden, fiducial volume, and radon contamination on directional reconstruction with large-scale Monte Carlo simulations. [C++]

Doctor Of Philosophy (Ph.D.), Nuclear Engineering

Master Of Science (M.S.), Nuclear Engineering

Bachelor Of Science (B.S.), Physics