Best known for the photography he published in LIFE magazine, Gjon Mili pioneered the use of stroboscopic instruments to capture a sequence of actions in one photograph. Mili trained as an engineer and worked closely with the renowned MIT researcher and inventor Harold Edgerton to develop the innovative stop-action technique. For LIFE, Mili photographed events, artworks, and architecture, as well as celebrities and artists, including Pablo Picasso. The iconic Spanish painter and sculptor took interest in Mili’s technical innovations and agreed to sit for several portrait sessions. Mili revisited Picasso many times over the years, documenting his artwork and capturing the artist in candid images. Mili is also noted for directing the short film Jammin’ the Blues (1944), which featured performances by Lester Young and Red Callender, among other performers, sharply lit against a black backdrop, and which is considered a landmark in the way that musicians have been filmed. In the 1940s Mili served as assistant to the photographer Edward Weston.