Greg Hurrell contributed to the microsoft/git repository by consolidating multiple contributor email addresses into a single mailmap entry, focusing on improving attribution accuracy and traceability. Using git and version control best practices, he unified three distinct addresses for a long-standing contributor, ensuring that all historical and future contributions are correctly attributed. This work involved careful editing of plaintext mailmap files and the inclusion of proper Signed-off-by lines to maintain compliance and auditability. While the scope was limited to data quality rather than code changes, the update enhanced the maintainability of contributor records and reduced confusion in project governance processes.