This special section of IEEE Systems, Man, and Cybernetics Magazine contains contributions on a timely research topic: brain–machine interface (BMI) systems. The section was solicited by the late Mo El-Hawary, past editor-in-chief of the magazine. It includes a pictorial view of BMI activities sponsored by the IEEE Systems, Man, and Cybernetics (SMC) Society as well as technical articles. Also included in this section is an interesting reprint from Communications of the ACM where SMC Society members Jose del R. Millan, Michael H. Smith, and 2019 SMC BMI Workshop panelist Al Emondi dis cuss brain–computer interfaces (BCIs). A collection of testimonials was also solicited to honor Michael H. Smith, the driving force behind the Society’s BMI efforts and activities. (See “Testimonials”.) Finally, I very much appreciate contributions by Tiago H. Falk, Christoph Guger, Ricardo Chavarriaga, Joel Libove, the authors of testimonials and technical articles submitted to this special section, and the valuable and extensive efforts of the reviewers.