Dr. Jennifer Arnold and husband Bill Klein both have achondroplasia, a bone-growth disorder that causes dwarfism. They are stars of the reality show "The Little Couple" - Jennifer is a neonatalogist who works at the Texas Children's Hospital (she did her residency at Children's Hospital of Pittsburgh, where most patients older than 4 are taller than she is) and Bill is a businessman.
The show features their efforts to build a house that is customized for their size, start a new business, and have a child.
Achondroplasia is caused by an autosomal dominant allele and individuals who inherit two copies of the allele do not survive to birth.