Music Leaders


Music Leaders

Director of Music, Principal Organist

John-Luke Addison is a Canadian-American pianist, conductor, music director, accompanist, organist, and composer. Prior to St. Bartholomew’s, he had been Director of Music at various churches in Toronto, Canada, as well as conductor of several other choral and orchestral ensembles. In the theatrical realm, Mr. Addison has been the music director or orchestra member for over 50 theatrical productions, both professional and amateur, including at Shaw Festival, Sheridan College, Drayton Entertainment, and many others. As a composer, Mr. Addison has had compositions performed internationally, including by the Canadian Opera Company and San Francisco Opera Company, and is also a freelance copyist and editor. He has a graduate degree in Music from York University in Toronto, specializing in classical performance and composition, and has done extensive research on 18th-century oratorio and the music of Georgian Britain. Contact John-Luke Addison.


Jenny Yun began playing piano at age five. She credits her pianist mother for the early start. One of her proudest moments came at age fourteen when she performed Mozart Piano Concerto No. 26 in D major with the Korean Symphony. She went on to study Music Composition and Theory at Seoul National University, where she began to appreciate a broad range of musical compositions and their impact. Jenny’s passion for pipe organ began at the University of Kansas where she received her M.A. in Organ Performance. She has studied under renowned teachers Dr. James Higdon at the University of Kansas and Dr. Thomas Ladd of the University of Southern California. Her many years of experience as organist at Lutheran and Episcopal Churches left her with a deep understanding of Congregational Hymns and Liturgy and allowed her to appreciate the music of J.S. Bach and Brahms even more. She is a busy and proud mom of three daughters, Emily, Claire, and Grace.

Parish Choir Section Leaders

St. Bartholomew’s is privileged to have professional section leaders serve in each vocal part within the parish choir. From the greater San Diego community, they are teachers and mentors, singers and students; they serve as soloists as needed, help shape the sound of their section, and guide new singers in the choir.

Tim McLellan has served as bass section leader at St. Bart's since 2005. Throughout his musical career, he has sung and conducted at Catholic, Lutheran, Methodist, Baptist, and Assembly of God churches. He holds degrees in music from Cal Poly State University and the University of Washington. When he's not at St. Bart's, he teaches math and music to middle school students in San Diego Unified School District.

Sean McCormac, tenor section since 2011. Home-schooled from kindergarten through 12th grade, he attained his bachelor’s degree in vocal performance from Cal State Northridge. Sean also serves as tenor section leader for the La Jolla Symphony Chorus. He is a frequent performer with the San Diego Pro Arte Voices and has provided solo work for the Palomar College Chorale and Bodhi Tree Concerts. 

Beatriz Avila Casillas, alto section leader. Beatriz’s life revolves around two things: singing and playing viola. Her musical career began at Palomar College when she entered the Applied Music Program. Here, she studied and performed voice. She graduated with an Associate’s of Arts Degree in Music Spring of 2018 and has plans to further her education. During the time Beatriz was in school, she volunteered as a violin/viola teacher at Renaissance Institute of Music (RIOM). She continues to teach groups of students as well as private lessons; however, she is now the Program Manager of RIOM. Aside from this, she participates in the Center Chorale of Escondido as a Voice Scholar and in MiraCosta College Orchestra as a violist.  

Sophia (Sophi) Gonzalez, soprano section leader. Sophia is working toward a degree in music education at San Diego State in hopes of a career in choral directing and instruction. Sophi teaches music part-time at St. Martin of Tours Academy in La Mesa and in the last year served as SDSU University Chorus Manager and as coordinator for Choral Collage, SDSU’s first national choral festival. During summer 2017, she worked as the vocal director for the San Benito Stage Company production of Annie.