Danny Chen started his career almost 40 years ago as a UNIX performance engineer at Bell Laboratories where he was a co-developer of one of first general purpose UNIX kernel tracing facilities (USENIX/1988: CASPER the Friendly Daemon). He also contributed to the SVR4 virtual memory implementation (USENIX/1990: "Insuring Improved VM Performance - Some No-Fault Policies). Since then he has worked on a wide variety of systems ranging from low latency market data to distributed transaction managers—all while tailing logs.