It was released in 1991 and added a new sound by using jazz-like harmonies, subtle Latin rhythms and unusual time signatures.

Bassist Roger Patterson wrote the bass lines for Unquestionable Presence, but died in a touring van accident before the recording sessions took place.

According to Eduardo Rivadavia of AllMusic, Unquestionable Presence is characterized by "sparing but highly effective use of melody (mostly nuances and accents during solos and choruses).

"[1] Unquestionable Presence is considered a landmark album in the genre of technical death metal.

[5] Phil Freeman in The Wire (issue 261, p. 53) described Unquestionable Presence as a "more complex and progressive album, every song rocketing through multiple tricky time signatures and endless variations on already baffling riffs.