Principal Software Engineer and founding engineer at Contrast Security. I build runtime instrumentation and security systems: CLR internals and IL rewriting, Windows kernel drivers, process attachment and injection, and eBPF-based workload visibility on Linux, in C++, Rust, and C#.

Co-inventor on US Patent 11,222,122: Method and System for Runtime Instrumentation of Software Methods.

microsoft/CLRInstrumentationEngine

Microsoft's cooperative profiler for running multiple .NET profilers in one process.

• #303: Fixed stack-depth calculation for calls to generic methods. The engine used the MethodSpec signature, which encodes only generic arguments, producing a too-low maxStack and InvalidProgramException in instrumented applications.
• #278: Reused the existing AssemblyInfo in AssemblyLoadFinished instead of creating a new one that overwrote the instance already registered during ModuleLoadFinished.
• #276: Fixed AssemblyInfo::GetModules, which always returned a NULL IEnumModuleInfo.

microsoft/elfcore

Rust crate for creating core dumps of running Linux processes.

• #39: Fixed the aarch64 build of the Linux ptrace path, added ARM64 CI builds and tests, and updated tests for aarch64 register layouts.

• PearlHq: Pet food and water sensors on an Adafruit Feather ESP32-C6, with a backend and web UI.
• SpaceViewportStudio: Generates deep-space panoramas spanning linked Lian Li TL LCD case fans.
• ClueSnake: Snake on the Adafruit CLUE (nRF52840) in C++.
• PwnNetShell: ASP.NET web shell built for authorized penetration testing engagements at Aspect Security (circa 2012).

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