Jonathan R. Leong Email & Phone Number

Hannover, Lower Saxony, Germany

Research Lead in ML, AI, and Automation for Entity Mapping, Specialist in Graph Representation Learning- Developed ML methods for mapping internet assets to entities (4x increase in average precision)- Drove application development using a several TB graph dataset (1011 nodes, 1011 edges)- Utilized Python and PySpark on AWS Sagemaker and AWS EMR clusters for feature extraction- Conducted non-linear feature engineering- Fit logistic regression, tree-based, neural network, and… Show more Research Lead in ML, AI, and Automation for Entity Mapping, Specialist in Graph Representation Learning- Developed ML methods for mapping internet assets to entities (4x increase in average precision)- Drove application development using a several TB graph dataset (1011 nodes, 1011 edges)- Utilized Python and PySpark on AWS Sagemaker and AWS EMR clusters for feature extraction- Conducted non-linear feature engineering- Fit logistic regression, tree-based, neural network, and graph neural network models to noisy data using scikit-learn, XGBoost, and Deep Graph Library (DGL)- Implemented the first ML inference model running in production at Bitsight using PMML- Investigated the application of graph representation learning for cybersecurity tasks- Led discussions and gave presentations to multidisciplinary teams and external stakeholders Show less

Honolulu, Hawaii, United States

Technological concept architect, technical lead, and developer for various interdisciplinary projects having potential commercial impact in a wide range of industries: agriculture, oil and gas, defense, etc.- Directly responsible for awards of $2.6M in highly competitive contracts- Customer relations and project oversight for novel High-Frequency antenna system development (Phase I award: $140k)- Technical lead for development of a novel handheld, non-contact, laser ultrasound… Show more Technological concept architect, technical lead, and developer for various interdisciplinary projects having potential commercial impact in a wide range of industries: agriculture, oil and gas, defense, etc.- Directly responsible for awards of $2.6M in highly competitive contracts- Customer relations and project oversight for novel High-Frequency antenna system development (Phase I award: $140k)- Technical lead for development of a novel handheld, non-contact, laser ultrasound imaging device (Phase I award: $280k, Phase II award: $1.1M)- Development of various control systems for pointing of devices (Phase II option award: $300k, Sequential Phase II: $800k)- Statistical analysis fitting diffusion maps to complex, non-linear dynamic data using Python- Data analysis, data modeling, and simulation development using Python and SQL- Project status presentations to all audience levels (technical and non-technical)- Granted US SECRET Security Clearance ( November 2021) Show less

Celle, Germany

Investigation lead and product developer for piezo technologies in acoustic, downhole Logging While Drilling (LWD) devices for oil and gas applications- Led a reliability investigation campaign of a LWD (underwater 175°C, 2000bar) acoustic source producing 10kPa sound waves and developed a solution that increased its lifetime 10x- Led investigations of an interdisciplinary team of engineers for verification of critical design aspects of novel LWD acoustic receivers with sensitivities of… Show more Investigation lead and product developer for piezo technologies in acoustic, downhole Logging While Drilling (LWD) devices for oil and gas applications- Led a reliability investigation campaign of a LWD (underwater 175°C, 2000bar) acoustic source producing 10kPa sound waves and developed a solution that increased its lifetime 10x- Led investigations of an interdisciplinary team of engineers for verification of critical design aspects of novel LWD acoustic receivers with sensitivities of 1e-2Pa/rt(Hz), which led to the discovery of critical design flaws in one of two design options- Used Matlab, Simulink, and ANSYS to develop models and analyze test data- Acoustic tools that I worked on are similar to the gamma ray tools displayed in the video below. These tools help the drill bit navigate within the rock formation. Show less

Hannover, Germany

GEO600 Gravitational Wave Observatory- Observatory belongs to an international collaboration of over 1000 scientists and engineers- GEO600 is a highly complex Michelson interferometer with resonant cavities to prevent the loss of light and signal power- Around 300 interacting control loops, some of which have a 300dB sensing and actuation dynamic range, are required to keep this instrument running at the impressive noise level of 1e-19m on the differential length measurements-… Show more GEO600 Gravitational Wave Observatory- Observatory belongs to an international collaboration of over 1000 scientists and engineers- GEO600 is a highly complex Michelson interferometer with resonant cavities to prevent the loss of light and signal power- Around 300 interacting control loops, some of which have a 300dB sensing and actuation dynamic range, are required to keep this instrument running at the impressive noise level of 1e-19m on the differential length measurements- Technological advancements developed and tested at GEO600 were crucial elements in the design of the Advanced LIGO observatories, which made the first direct detection of gravitational waves that was announced in 2016GEO600 commissioning team lead- Steered and coordinated experimental campaigns - Led experimental campaigns to hunt for noise sources- Led investigations into the effects of hardware improvements, and the interactions of new hardware implementations with the rest of the device- Led an effort that identified an unexplained noise source and implemented a hardware change to the suspensions of the GEO600 output optics that resulted in a 100x reduction of noise over a 100Hz frequency band.Responsible for the conception, recruitment, and management of the data analysis team- Utilized statistical methods to find correlations in data, sometimes sifting through a 700TB dataset, which led to hardware improvements such as the 100x noise reduction mentioned above - Acted as software lead for the implementation of statistical methods and data visualization techniques for the purpose of experimental investigationsPrizes associated with the first direct detection of gravitational waves- Won the 2016 Special Breakthrough Prize in Fundamental Physics (most lucrative academic award) as part of an international collaboration- Work contributed to the awarding of the 2017 Nobel Prize in Physics to three members of the collaboration Show less

Hannover, Germany

Commissioning of upgrades and scientific investigations on GEO600- Designed experiments for control loop improvements and noise hunting investigations- Contributed to the control architecture of GEO600 that included new digital control hardware (hardware installation and programming of virtual instruments in LabVIEW and MEDM)- Used Matlab to analyze experiment data using statistical methods

Cleveland, Ohio

Cosmic Microwave Background (CMB) Radiation- Focuses on afterglow radiation of the big-bang with a temperature of -270°C- Radiation is mostly uniform over the sky except for small variations on the order of 1e-5, which reveal many things about the structure of the universe- Polarization non-uniformities on the order of 1e-6 hold the signature of gravitational waves emitted from the big bang which would enable observations back to the very beginning of the universeCryogenic… Show more Cosmic Microwave Background (CMB) Radiation- Focuses on afterglow radiation of the big-bang with a temperature of -270°C- Radiation is mostly uniform over the sky except for small variations on the order of 1e-5, which reveal many things about the structure of the universe- Polarization non-uniformities on the order of 1e-6 hold the signature of gravitational waves emitted from the big bang which would enable observations back to the very beginning of the universeCryogenic detector development and characterization for observations of the CMB- Responsible for noise modeling, designing, and fabrication of multiple bolometric detector systems for making microwave measurements of the polarization of the CMB (sensors operating at 0.25°C above absolute zero w/ 500u°C sensitivities)- Developed a software simulation suite in C to model the multimode waveguides (hundreds of modes) used in the innovative detector architecture studied in my thesis- The South Pole Telescope showcased in the video below is the first project I worked on as a graduate student. I performed scattering simulations for a few of the design configurations using ZEMAX (optical ray tracing software) Show less

Honolulu, Hawaii

Software development and data reduction for the NASA Infrared Telescope Facility and the Keck Observatory- Code written in the Interactive Data Language (IDL)- Software development of a pre-processing suite to remove non-linear behavior in the sensor used for taking spectral data

Pasadena, California

Cryogenic Radio-Frequency Interference (RFI) filter development for observations of cosmic microwave background radiation

Bachelor Of Science - Bs, Physics

Thesis: "Design, implementation, and testing of a new space efficient Radio Frequency Interference filter for the cold stage.

Doctor Of Philosophy - Phd, Physics

Thesis: "Characterization of the Polarization and Frequency Selective Bolometric Detector Architecture."