Joshi was born in Kathmandu, Nepal. At the age of 19, Joshi moved to Los Angeles, California. He went to California State University Long Beach for his undergraduate and graduate degrees in Computer Science and Engineering. In 1991, Disney recruited him to work on Disney's Computer Animation Production System which led to his career in animation. He co-developed the herding system for the wildebeest stampede sequence in "The Lion King". After supervising early production for animation legend Glen Keane on Tangled, Joshi left Disney in 2007 to start his own studio Incessant Rain Studios. In 2017, he produced and co-directed an award-winning documentary "Moving Mountains: The Awakening" which is based on Nepal's devastating 7.8 M earthquake that took place in April 2015. In 2019, Joshi directed and produced an animated short "Mandala".