Music & Worship Staff

John Gross, Minister of Music

John Gross is the Minister of Music at Cornerstone Church in San Antonio, Texas. He has played professionally since the age of 10, and has been involved in the musical community in San Antonio for several decades. He received a Bachelor of Music (Jazz) from North Texas State University in 1973 and a Master of Music (Music Theory) in 1978 from Texas State University.

An ordained minister, John has written and arranged a significant amount of Christian music in all styles. Of particular interest is contemporary praise music, choral with large orchestra, gospel, Jewish, big band, traditional Irish, and bluegrass. John plays guitar, piano, steel guitar, violin, 5 string banjo, and mandolin. He is also an avid mountain biker. He and his wife, Lestra, have 3 children and 7 grandchildren. 

Christopher Sizer, Choir Coordinator

Christopher was born and raised in northern New Jersey, where he began his formal music lifestyle playing trombone in grammar school.  By this time he had been singing in church choir at the Rescue House of Prayer in South Plainfield NJ.  During High School he sang in the Chorus, Men’s Chorus and Madrigal Singers as well as studying music theory and playing in the Jazz, Concert and Marching Bands. 

Christopher continued his education at Glassboro State College, one of the best colleges in NJ for studying music.  After his freshman year, finding himself unable to continue with school, he joined the US Navy, serving eleven years as an Air Traffic Controller.  Not forgetting his music training, Christopher lead Praise & Worship for a small church in Corpus Christi, Texas.  

After moving to San Antonio and through much inquiry, he found Cornerstone Church.  In a short time he was singing for the singles group, the home ministry group he attended, then in the choir.  Much to our great pleasure, shortly thereafter Christopher became part of the music staff here at Cornerstone.  August 2011, marks his eleventh year staff member celebration at Cornerstone.   Christopher has said many times over the years, "My worst day at Cornerstone is better than my best day anywhere else."  Christoper loves his job and he loves Jesus, and it shows. 

Christopher and his wife Julia have three children, Claudia, John and Frances.  The two youngest are named after Christopher's parents and the two girls share both of their grandmother's middle name, Elizabeth.  Christopher avidly sings Barbershop, and is an active cyclist starting the cycling club here at Cornerstone.