Leonardo Gustavo Gimenez, better known by his stage name Oni Logan, is an Argentine American singer, best known as the original lead vocalist of the rock band Lynch Mob.

In 1990, Lynch Mob released their first album Wicked Sensation, which featured Logan on lead vocals.

Logan formed the band Violets Demise with former Dio guitarist Rowan Robertson, 21-year-old Scot Coogan, and bassist Spencer Campbell.

Before resurfacing in L.A. clubs with his band Head Set, Logan took a hiatus from the music business and spent 7 years living in Switzerland.

Logan reunited for a tour with Lynch Mob in 2008, and appears on the band's 2009 Smoke and Mirrors album.

[4] Logan re-joined Lynch Mob in early 2012[5] and was the co-songwriter and vocalist on the 2012 Sound Mountain Sessions EP.

[8] In 2023, Oni released a new EP titled "The Cosmic Trust Sessions" via on his website http://www.oniloganofficial.com/ Available only as a physical CD purchase.

[9] Ronnie James Dio: This Is Your Life (2014, featuring Jimmy Bain, Rowan Robertson, and Brian Tichy, covering "I") Steve Saluto - "12" EP (2013) Featuring Oni Logan, Brian Tichy, Steve Saluto and Thomas Nero.