Oscar Passley has served on the faculties of the Elan International Music Festival, University of Kentucky Summer Trumpet Institute, Blast of Brass Summer Festival, Tarrant County College (Northwest campus), Northlake College, Collin College and co-founder/host of the annual Dallas Trumpet Workshop. Currently, Passley is the faculty coordinator of the music department at Eastfield College and Lecturer of Trumpet at the University of Texas at Arlington. He is sought after as an adjudicator and clinician throughout the state and nation conducting clinics and workshops at schools and festivals including the Dallas Music Educators Association Jazz Festival, Tarleton State University Jazz Festival, Southwestern Oklahoma State University Jazz Festival, Baltimore County Public Schools High School All Honors Jazz Concert, National Trumpet Competition Jazz Semi-Finals and the International Trumpet Guild Jazz Scholarships Competition. In addition, he has also been a guest artist at numerous colleges and universities throughout the country including Mountain View College, Richland College, Missouri State University, Northeastern State University, Southeastern Oklahoma State University, Oklahoma Baptist University, Texas Wesleyan University, Texas A&M University at Commerce, University of Dallas, Texas Christian University and Baylor University.

Equally proficient in both classical and jazz genres, Oscar Passley has performed with groups such as the Price/Wright Jazz Orchestra, Kitchen Sync Big Band, Rizpah Lowe Jazz Quartet, Alexandria’s Ragtime Band, Bourbon Street Stompers, Inner City All-Stars Brass Band, Eastfield College Faculty Jazz Combo, Texas Star Brass Band, Dallas Wind Symphony, Las Colinas Symphony, Garland Symphony, Arlington Symphony, New Philharmonic Orchestra of Irving, Chamber Orchestra of Denton, Voices of Change, Metropolitan Classical Ballet Orchestra, and was Co-Principal at the 2008 Missouri Symphony Summer Festival. He also has been performing with the Dallas Opera Orchestra since the 2005-2006 season.

Oscar Passley has shared the stage with such notable musicians as Andrea Bocelli, Denyce Graves, Michael Sachs, Scott Hartman, Elizabeth Freimuth, Gladys and "Bubba" Knight, Louis Price (former lead singer for the Temptations), Heather Headley, "Bebe" Neuwirth, B. J. Thomas, Bowling for Soup, Rebirth Brass Band, Steve Lippia, Benjamin Wright, Winard Harper, Regina Carter, Bobby Sparks, Keith Anderson, Brad Leali, Tony Baker, Byron Stripling and Wynton Marsalis.

In June 2018, Passley joined the SMU Meadows new music ensemble SYZYGY on a three city tour of South Africa. He played principal trumpet in the “Wading Home" chamber opera production. Venue performances that took place included Nelson Mandela University, Stellenbosch University and University of Pretoria.

A native of Baltimore, Maryland Passley graduated from Morgan State University with a B.A. in music where he studied trumpet with Melvin Miles. He finished master degrees in trumpet performance (M.M.) and music education (M.M.E.) in 2004-2005, studying jazz trumpet with Mike Steinel and classical trumpet with John Holt at the University of North Texas. Dr. Passley holds a Doctor of Musical
Arts in trumpet performance at UNT.