Ten months later, Warren climbed Cradle Mountain, Tasmania, Australia using a modified wheelchair and the seat of his pants. A year later he climbed Federation Peak in Tasmania, Australia. In February 2003 he became the first double-above knee amputee to reach the summit of Mount Kilimanjaro in Tanzania, Africa's tallest peak while using specialty climbing prostheses developed by Hanger prosthetists Kevin Carroll and Chad Simpson. More recently Warren climbed El Capitan in the Sierra Nevada, California, United States and the Weeping Wall in Alberta, Canada.