In 1993, Johansson co-founded a progressive blues metal project, The Johansson Brothers, and recorded a self-titled record. In 1996, with a different line-up, they recorded another album, Sonic Winter, this time under the name "Johansson", with Yngwie Malmsteen guesting on guitar. The last Johansson record, The Last Viking, a more "European metal" oriented album, was released in 1999 with special guests Michael Romeo and Göran Edman.
He co-founded Heptagon Records to distribute his own recordings and that of other musicians, such as guitarist Benny Jansson and bassist Magnus Rosén.
Johansson auditioned for Dream Theater after Kevin Moore left the band in 1994 but due to many delays by the band in making a decision he instead joined Finnish power metal band Stratovarius. Since 1995 he has remained in Stratovarius, and still releasing solo albums and appearing as a guest or session musician in other projects.
Johansson is a self-confessed computer nerd, admitting to have started on an Atari ST (which he still owns), and having coded software in C, as well as his own website in Perl. He rejects being considered one of the best keyboardists in the world, as he believes there are many people that are far better than him. Johansson is an atheist.
Johansson has used many types of keyboards and synthesizers throughout his career. Amongst his favourites are the KorgPolysix, YamahaDX7 (from the Rising Force times to present), the Oberheim Matrix Series and the RolandJV-1080 sound module. He is also fond of the Hammond Organ. Johansson is a computer fan and long-time Steinberg programs user (like Cubase). An example of his interest in computers is his record Fission, which is replete with special effects and sound experimentations. For his famous lead sound he uses a Morley JD-10 amp simulator as distortion.