Born in Wisconsin, USA. Entered American film as a set dresser for Grand National Pictures' GREAT GUY (1936). He did interiors for STAGE DOOR CANTEEN (1943) and SINCE YOU WENT AWAY (1944). Among his set decorating credits are TARZAN'S DESERT MYSTERY (1943), THE MUMMY'S CURSE (1944), SALOME WHEN SHE DANCED (1945), THE CHASE (1946), THE SIN OF HAROLD DIDDLEBOCK (1947), THE MAGNETIC MONSTER and WAR PAINT (both 1953), RIDERS TO THE STARS, GOG and RING OF FEAR (all 1954), NOT AS A STRANGER and BLOOD ALLEY (both 1955), THE SEARCHERS, THE COME ON, CRASHING LAS VEGAS, FLIGHT TO HONG KONG and THE KING AND FOUR QUEENS (all 1956), TIME LIMIT (1957), TARZAN AND THE TRAPPERS, THE PROUD REBEL, I WANT TO LIVE! and THE PROUD LAND (all 1958), THE MAN IN THE NET (1959), THE ALAMO (1960), WEST SIDE STORY (1961), SERGEANTS 3 (1962), DIARY OF A MADMAN, TOYS IN THE ATTIC and PROMISES! PROMISES! (all 1963), THE NAKED KISS (1964), YOUNG DILLINGER (1965), and WILD WILD WINTER, THE TROUBLE WITH ANGELS and DUEL AT DIABLO (all 1966). Gangelin's television credits include "The Roy Rogers Show", "My Mother the Car" and "The Big Valley."  Nominated for Interior Decoration (Black & White) 1944: SINCE YOU WENT AWAY - Interior Decoration  Art Direction/Set Decoration (Color) 1961: WEST SIDE STORY - Set Decoration 2 nominations, 1 Award