È considerato come il più grande cantante reggae dopo Bob Marley, e fu proprio Marley a dargli il titolo di "The Crown Prince of Reggae".
Discografia
Singoli
Money In My Pocket (1977)
Love Has Found Its Way (1982)
Halfway Up Halfway Down (1982)
Album
No Man Is An Island (1970)
If I Follow My Heart (1971)
Super Reggae & Soul Hits (1972)
Superstar (1973)
Deep Down (1974)
Just Dennis (1975)
Visions (1976)
Westbound Train (1977)
Wolf & Leopards (1977)
Joseph's Coat Of Many Colors (1979)
So Long Rastafari (1979)
Words of Wisdom (1979)
Best of Volume I (1979)
Live At Montreux (1980)
Spellbound (1980)
Money In My Pocket (1981)
Best Of Volume II (1982)
Love Has Found It's Way (1982)
More (1982)
Stagecoach Showcase (1982)
Yesterday, Today, & Tomorrow (1982)
Satisfaction Feeling (1983)
The Prophet Rides Again (1983)
& Gregory Isaacs - Judge Not (1984)
Love's Got A Hold On Me (1984)
Revolution (1985)
Slow Down (1985)
& John Holt - Wild Fire (19