Bob Marley remains the most widely known and revered performer of reggae music and is credited with helping spread both Jamaican music and the Rastafari movement to a worldwide audience. He died of cancer, aged 36, on 11 May 1981.

Thirty years after his death, photographer Kim Gottlieb-Walker looked through her archives and scanned negatives to find photographs of Bob Marley she had completely forgotten about. Some of them are now being exhibited in London and later this year they will also be shown in Paris and Amsterdam.

Kim Gottlieb-Walker says what she does is totally different to the pictures taken by paparazzi photographers. While they take people's pictures without their permission, what she does is "a mutual act of giving". She says: "I give them what skill I may possess and they give me their trust."

Bob Marley stated that his two biggest influences were the pan-Africanist activist Marcus Garvey and King Haile Selassie of Ethiopia. A central theme in Bob Marley's message was the repatriation of black people to Zion, which in his view was Ethiopia, or more generally, Africa.

Bob Marley faced questions about his own racial identity throughout his life. He once reflected: "I don't have prejudice against meself. My father was a white and my mother was black. Them call me half-caste or whatever. Me don't dip on the black man's side nor the white man's side. Me dip on God's side."

When Bob Marley was being introduced to journalists it was very important for him to communicate that his music was more than something to dance to. Rather, it was the message of brotherhood and love, and how we need to love each other so the world could evolve into a better place.

Kim Gottlieb-Walker never staged her photographs. "The one in the Cadillac was taken when they were on their way to the recording of a variety show. Bob and [his band] the Wailers piled into the car and as they left I waved and Bob turned round and gave me a big grin so I snapped the picture," she says.

One of Bob Marley's biggest challenges was introducing reggae to the American public. In 2001, he was posthumously awarded the Grammy Lifetime Achievement Award, and a feature-length documentary about his life, Rebel Music, won various awards at the Grammys.