[gaylemcd]

It's hardly rife with non-programming authors.

Elements of Programming Interviews: authors include an algorithms professor, a software engineer, and an engineer/CTO.

Programming Interviews Exposed: authors include software engineer, a CEO & VP Technology, and a radiologist. (Note that this book was written a long time ago. The radiologist probably was a programmer at the time.)

Ace the Programming Interview: software developer

Data Structures and Algorithms Made Easy: software developer

Out of 9 authors (including myself), 8 are/were software developers or something else very, very deep in technology. Possibly all 9.

Notably, zero are/were recruiters.