Patrick Kelsey Email & Phone Number

Providing a wide range of hardware and software architecture and implementation services to a variety of clients, from startups to Fortune 100 companies. Recent projects have run the gamut, from rapidly porting a video analytics SDK to an esoteric operating system to architecting highly available distributed and extreme low latency storage systems.

Architected high performance support of specific TCP-based protocols for a highly scalable, fault-tolerant, single system image symmetric multi-computing platform. In particular, I designed and implemented a directorless, live-scalable, N-way replicating NFS server distributed over many nodes that used a multicast TCP implementation to serve standard NFS clients via a single IP address.

Developed space and speed optimized B+trees for a high performance OLTP database engine.

Designed and implemented scalable, high performance kernel-mode object file system under contract with a top storage OEM. Extended and enhanced object file system for an internally developed product line. Helped architect a multi-protocol object storage server, including advanced features such as snapshot, thin provisioning, encryption, deduplication, compression, object authentication, migration, and replication. Designed and prototyped multiple object storage access methods including SBC, OSD, VFS, CIFS, NFS, and Web Services (REST, SOAP). Designed and implemented advanced data structures, caches, and mathematical models thereof.

Designed and implemented circuits and software for a modular, distributed industrial control platform for MIL-SPEC harsh environments. Architected a scalable network software infrastructure covering six physical layers and over 20 upper layer protocols. Designed and implemented a managed ethernet switch, including novel active and passive port failover mechanisms. Advised the Engineering Services Group in the areas of video compression, distributed algorithms, and networking. Made key contributions to successful SBIR Phase I and Phase II grant proposals.

Formerly InfiniCon Systems. Subsequently acquired by QLogic, then sold to Intel.

Developed multiple generations of dual-port InfiniBand to Fibre Channel bridges for modular shared I/O system, from chip selection, to software architecture, to high-performance driver development. Developed both initiator and target storage virtualization techniques. Designed algorithms to automatically provision storage bridge resources in InfiniBand fabrics. Developed protocol and bus models for system sizing and performance estimation. Provided technical review of new hardware designs.

Designed and implemented a real-time, low-latency video transcoder on dense (144 cores-on-a-sheet-of-paper) NUMA parallel DSP platforms, including both parallel and multi-channel variants, as part of an early 3G cellular project. Wrote many real-time embedded applications and drivers involving various combinations of ATM, T1/E1, Ethernet and serial feeds carrying voice, video and/or data.

Developed mobile robot motion control and path-planning algorithms and implemented them on embedded platforms. Developed dynamic models and simulations of those models to aid the control and planning algorithm development. Developed software for the FBI to aid forensic document comparison. Assisted in preparation of proposals to NSF, DoD, and others to secure lab funding. Taught undergraduates in the areas of numerical methods and system modeling and control techniques.

Designed a DSP plugin card (schematics, PCB layout, CPLD coding, simulation) for, of all things, the microchannel bus architecture. This was my first zero-defect hardware design and first commercially shipping project. Also wrote and ported embedded software including firmware loaders and a voice compression library.