In memoriam: David Harley

This memorial article honors David Harley, a veteran cybersecurity researcher, author, and mentor who served as an ESET Senior Research Fellow and contributed extensively to malware analysis, antimalware testing standards, and the human factors of cybercrime. Colleagues share tributes highlighting his intellect, mentorship, editorial rigor, and musicianship, reflecting on decades of collaboration and community impact. The piece notes his passing at 76 and points readers to his preserved writings and musical work.