Joan Colom is Spanish (Catalan) photographer from Barcelona.
Born in 1921, he started taking street pictures in the "red lights" district El Barrio Chino (i.e. Chinatown, now "Raval") at the age of 37.
He had a day time job in accounting and use to shoot during weekends.
I love his style partially because of my addiction to shooting candids "from the hip".
Almost all of his images from 1958 to 1964 were shot "clandestine".
He did this because he tried to capture something very elusive: the glances, gestures, grimaces, poses, all king of people-to people interactions.
He wanted for his pictures to be emotional and alive, to capture the life in its moments and let it live in the photographic form forever.
And he succeeded.
I do not know any other photographer of the time so dedicated to this idea of capturing moments of life as Joan Colom was.
Here is he shooting in Raval with his Leica M2:
You see why the most of his pictures are verticals (i.e. "portrait" orientation).