Until recently, usability was often an afterthought when developing security tools. These days there's growing realization that usability is a fundamental part of security. Lorrie Cranor is director of the CyLab Usable Privacy and Security lab (CUPS) at Carnegie Mellon University. She shares the work she's been doing with her colleagues and students to improve security through usability.
The research can be found here:
https://www.cylab.cmu.edu/news/2019/07/29-usability-history.html