David Ruffner Email & Phone Number

New York, New York, United States

Management- Member of senior management team involved in decisions about new product ideas, personnel, and setting company priorities.- Led successful transition to Scrum for software team and took on scrum master role.Data science and machine learning- Implemented robust particle hologram detector using Darknet YOLO convolutional neural network: - Increased recall from 72% to 92% on a test dataset. - Improved detection of small particles leading to higher customer satisfaction.- Converted particle detector to Tensorflow and improved robustness with data augmentation.- Built machine learning processing pipeline and data tracking using DVC.Software- Built software that controls sample loading robot for our particle analyzer. - Worked on interface between application and robot firmware. - Led to sales for biopharmaceutical, highthroughput groups.- Leading project to make Spheryx software compliant with CFR 21 part 11 regulations, a key step needed for quality assurance applications.- Made interactive visualizations with PyQT and Dash to explore accuracy of analysis.Science and engineering- Manage relationship with NYU collaborators to find opportunities for tech transfer.- Published paper on multicolor holography and coauthor on seven other publications.

Greater New York City Area

Science and Engineering- Developed commercial holographic particle characterization instrument.- Supervised scientists analyzing customer samples and prepared customer reports.Software- Set up SQL database and file store to keep track of experimental data.- Encouraged the adoption of software best practices such as pair-programming, a team style guide, automated tests, and a team git workflow.- Sped up academic python analysis code by 180x

I worked with David Grier, and studied optical forces in complex beams of light. Essentially we focused a powerful laser through a microscope objective and observed how the light moves tiny beads, which are about the size of a bacteria. We discovered that it is possible to use the polarization of the light to gain greater control over the optical forces. In addition we studied how light can not only push but also can pull small objects. We made such tractor beams on the microscale and are interested in understanding how to create long range tractor beams.

General Physics I (Lab instructor) - Fall 2009Quantum Mechanics - Fall 2010Graduate Electricity and Magnetism - Spring 2012

I worked with Haruo Kojima and studied solid He4 at low temperatures. We measured the effect of He3 impurities to better understand behavior that was thought to be caused by supersolidity.

Advisor: Prof. Robert Bartinski, Study of metallic quantum wells in thin metallic films.

Doctor Of Philosophy (Phd), Physics

Bachelor Of Arts (Ba), Physics