Randil Jeffreys studied Music Education at the University of Houston, Euphonium Performance at Idaho State University, and completed a Masters of Arts in Brass Performance at the University of Iowa where he served as the Tuba/Euphonium Studio Teaching Assistant. Randil was a performing member of The Cavaliers from 2003 until aging out in 2008.

Since 2015, Randil has been working in the DFW area, teaching a large private lesson studio, assisting performing ensembles, and working as a drill designer. Currently, Randil is involved in drill and show design for marching bands, indoor drumline, and collegiate marching bands across the country. In addition, he has taught drum corps with the Colt Cadets as the Brass/Visual Caption Head, as a visual instructor and Assistant Visual Caption Head with The Cavaliers and most recently, Randil served as the Visual Caption Head and Staff Coordinator at Music City Drum and Bugle Corps. Randil is also an active adjudicator and clinician.

In his leisure time, Randil loves spending time with his beautiful wife, Emily, and his son Adam. He is also an avid obstacle course racer and trail runner.