He was the co-founder of I. Magnin, an upscale women's clothing store in San Francisco, California.

Isaac Magnin (or Moeijen) was born into a Jewish family in Assen or Groningen, the Netherlands in 1842.

[2][5] A decade later, in 1876, he set sail for San Francisco via Cape Horn, with his wife and children.

[2] With his wife, he was also the co-founder of I. Magnin, an upscale women's clothing store in San Francisco.

[1][2] They had eight children: Samuel, Henrietta, Joseph, Emanuel John, Victor, Lucille, Flora, and Grover.