Joannah Nanjekye is a programming languages researcher in an IBM lab at the University of New Brunswick. Her research spans programming language design, optimization and garbage collection. She is the author of the book, Python 2 and 3 Compatibility, published by Apress, but has also authored several peer reviewed papers on programming language implementation and optimization. She is a former director of the Python Software Foundation and Python core developer whose interests are on the C API and subinterpreters.