In 1990 he decided to move to Florida to form the band GHOST with Welsh ex-UFO and WASTED guitarist Paul Chapman. From 1999 to 2002 Carl became the lead singer of the Swiss Hard rock band KROKUS and recorded the album "ROUND 13”. In 2006 Carl joined up with DEEP PURPLE’S keyboardist DON AIREY for his solo project "DON AIREY AND FRIENDS" and has co-writen with Don ever since. Albums include "A LIGHT IN THE SKY", "ALL OUT", "KEYED UP", "ONE OF A KIND" and the Live album Don Airey and Friends “LIVE IN HAMBURG”.
In 2009 Carl recorded his first solo album “MIND DOCTOR”. Firing up Persian Risk again led to two great albums "ONCE A KING" in 2012 and "WHO AM I" in 2014. In 2015 Carl became the new singer for the legendary rock band NAZARETH after founding member Dan McCafferty had to retire due to illness. Carl has recorded two studio albums with Nazareth: "TATTOOED ON MY BRAIN" (song credits: Never the Dance With The Devil, Change, State Of Emergency, Silent Symphony, Don’t throw Your Away) and “SURVIVING THE LAW” (song credits: Runaway, Falling In Love, Psycho Skies). Carl is currently touring all over the world with Nazareth. In 2021 Carl released another solo album “ELECTRIC EYE”. His next studio album “Silent Angels” will be released soon in 2024.">