[1] After starting as a bar cover band, they relocated to Brooklyn, New York, where they recorded The Worst Humans EP with producer Joel Hamilton.

Highly Suspect got their start in 2009 as a cover band playing songs by Sublime, Jimi Hendrix and Pink Floyd in local bars in the Cape Cod area, such as the British Beer Company, J.R Brody's Roadside Tavern, and Sundancers, also touring and playing a limited number of shows with bands 10 Years, Monster Truck and Sevendust.

The EP consists of "Life's a Fun Ride", "Not Me", and "Smile On", their first written and recorded songs after making the switch from a cover band ("Not Me" would later appear on the self-titled album Highly Suspect).

The band toured the United States in early 2015 with Deftones, Chevelle, Halestorm, Catfish and the Bottlemen and Scott Weiland from Stone Temple Pilots.

[12] In November, the band released their second single "Bloodfeather", which peaked at number 5 on the US Mainstream Rock Songs chart.

[15] A single featuring Young Thug entitled "Tokyo Ghoul" and Stevens' hip-hop persona "Terrible Johnny" was released October 4, 2019.

[18][19] The band's fourth full-length album The Midnight Demon Club came out on September 9, 2022, featuring singles as "Natural Born Killer", "Pink Lullabye" and others.

[26] Their third studio album, MCID, marked a change in sound and utilized elements of hip hop,[27][28] pop,[28] and electropop.