Joseph Leopold Eichler was a 20th-century post-war American real estate developer known for developing distinctive residential subdivisions of Mid-century modern style tract housing in California. He was one of the influential advocates of bringing modern architecture from custom residences and large corporate buildings to general public availability. His company and developments remain in the Greater San Francisco Bay Area and Greater Los Angeles.

Mid-century modern (MCM) is a movement in interior design, product design, graphic design, architecture and urban development that was popular in the United States and Europe from roughly 1945 to 1970 during the United States's post-World War II period.