Heber, who teaches science, is known as a well-liked teacher at the school, according to his father, David Heber.

CNN: Teacher talks armed student into giving up, police say

When David Heber appeared recently on ABC's Good Morning, America, viewers believed the noted nutritionist was pitching his new book, The L.A. Shape Diet.

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David Heber wasn't surprised that his son played a key role in defusing the situation, saying Ryan Heber makes a point of getting to know his students -- including the suspected gunman -- on a personal level.

CNN: Teacher talks armed student into giving up, police say