• US 10616516: Systems and methods for implementing time delay integration imaging techniques in conjunction with distinct imaging regions on a monolithic charge-coupled device image sensor
• US A1-20030131061: Transparent proxy server for instant messaging system and methods (Application)

• Landscape photography at scale.

• Specialize in migration to cloud hosting, automated system building, and system monitoring/instrumentation infrastructure. Particular interest in GIS databases and cartographic applications.

• Rewrote large parts of python+Java web service and underlying PL/pgSQL stored functions
• Designed context-specific map-matching/reverse-geocoding heuristics
• Refactored NAVTEQ NAVSTREETS data with custom schema and PostGIS
• Architected schema/procedures for deploying mixed NAVTEQ and OSM data
• Migrated significant portions of system to AWS EC2/S3/SQS/etc
• Redesigned data architecture/flow for dramatically higher throughput and lower query latency
• Developed autoconfiguring system instrumentation, alerting, and configuration management

• Develop and maintain server installation, upgrade, and data migration procedures.
• Lead the resolution of issues discovered in deployed production systems, including data analysis, designing fixes, and writing deployment risk assesments.
• Build monitoring and system analysis tools.
• Maintain and add features to in-house distributed configuration management system.

• Managed operations team in day to day operations as well as strategic architectural decisions.
• Built sophisticated application instrumentation infrastructure to deliver real-time metrics to meet both engineering and business needs.
• Developed various systems for monitoring and characterizing the agents and traffic flow in the BitTorrent network.
• Assisted with architecting a 300-machine datacenter build-out, including configuration of multi-homed Internet connections, layer 4 load balancers, and a multitier switch fabric.
• Automated the installation and monitoring of the various components of the BitTorrent Entertainment Network and BitTorrent DNA services.
• Oversaw the reorganization of data center resources as business plans evolved, as well as building a backup data center in Tokyo.

• System performance testing and comparison to certify new hardware for computation nodes and database servers
• Built new development cluster, including network, VPN, central authentication, and QA support tools
• Assist developers in fault-tolerant cluster design and automation.

• Deploy and maintain several different Tomcat and PHP-based websites in fault-tolerant configurations.
• Built out datacenter cage from scratch, including network and automated installation of new machines.
• Assist developers with code instrumentation, statistics, and lower-level tasks.

• Oversaw the maintenance and expansion of the company's satellite IP network based on iDirect technology.
• Managed end-user Voice over IP network and connectivity to public telephone networks.
• Developed techniques to improve the ongoing performance of voice and data traffic over satellite IP links.

• Designed ActiveBuddy Interactive Agent hosting platform and coded the dispatcher and message router components.
  • Involved designing a UDP-based inter-node protocol to exchange dynamic routing updates and maintain a stable cluster topology after host failover.
• Wrote components to connect to over a dozen different instant messaging networks, most requiring reverse-engineering.
• Led technical side of the BuddyScript Connectivity Services for wireless connectivity hosting
  • Started IMDSR project, including core and several modules utilizing a variety of devices to provider connectivity to GSM and Mobitex networks.
  • Developed client software to bring ActiveBuddy Interactive Agents to the RIM wireless email/PDA devices

Ported a real-time operating system from its native platform (the fixed-point Analog Devices ADSP-2181) to the next-generation floating-point ADSP-21065L SHARC platform.

• Wrote a series of tools to trap the execution of older, unsupported instructions and flag them
• When possible, allowed instructions to be automatically replaced with the their SHARC equivalents without interrupting execution
• Kept within timing constraints for attached bit-banged serial devices and codecs.
• Wrote adspsim, a software simulator for the ADSP-2181, as an intermediate tool

• Developed modular architecture for IM routing and application hooks, including an RPC mechanism for use between peered servers.
• Wrote support for AOL Instant Messenger, MSN/Windows Messenger, Yahoo Messenger, and IRC, among others.
• Designed inter-server message routing architecture and protocol for use in building trusted networks of IM users.

• Reverse-engineered the AIM protocol, examined packet traces and built tools to provoke the official clients into behaving in certain ways to provide useful traces.
• Provided freely available documentation on the protocol, in both code and prose.
• Designed the libfaim API to track a changing client user base as instant messaging gained widespread acceptance in free software world.

• Light-weight, minimalist library for easing the use of non-blocking BSD sockets.
• Supports Linux and FreeBSD quirks.
• Winsock2 (Win32) sockets supported using event object notification with the same API as UNIX.
• Included in Debian/Ubuntu.

• Specifically targeted for the RIM wireless device using Mobitex as a link-level transport.
• Implemented support for:
  • IPv4 (minimum Host Requirements, multiple interfaces)
  • ICMP (echo and basic errors)
  • TCP (passive and active connects)
• Includes a simple web server.

• Parses the dynamic link tables from the RIM application binaries and binds them to an emulated API, all other code runs natively on the host CPU.
• Used as a testing and development platform for intermobi and other RIM projects.

• Transformed the SysKonnect driver into a generic core and card-specific modules.
• Wrote modules to support Madge and Olicom brand devices
  • Required reverse-engineering for initial support
  • Extensive lobbying to those companies brought publicly available programming documentation

• Implemented opcode-level simulator of ADSP-2181 fixed-point digital signal processor for UNIX platforms.
• Supports DSP code profiling
• Offers hooks for emulating serial-port and memory-mapped devices

• GIS, cartography, and land use
• Landscape, low-light, aerial, and aviation photography
• Amateur packet radio
• Aviation, air traffic control, and airfield operations
• Cycling and bicycle building