John Mark Heard (December 16, 1951 - August 16, 1992) was an American record producer, folk rock singer, and songwriter originally from Macon, Georgia, United States. Heard released 16 albums, and produced and performed with many other artists as well, such as Sam Phillips (a.k.a. Leslie Phillips), Pierce Pettis, Phil Keaggy, Vigilantes of Love, Peter Buck of R.E.M. (who co-produced VOL's album Killing Floor with Heard), John Austin, The Choir, Randy Stonehill and Michael Been of The Call. Heard produced part of Olivia Newton-John's The Rumor, which also included a cover of Heard's own "Big and Strong" (originally called "How to Grow Up Big and Strong").