Mr. Fowler is the father of Amy Farrah Fowler.

He has yet to be seen in the show ever since his daughter made her first appearance in the Season 3 finale "The Lunar Excitation" (S3E23).

He was briefly mentioned by Amy in "The Emotion Detection Automation" (S10E14), but no information about him was said.

Because of this, it has been unknown his status of her father is unknown whether he is still married to Amy's mother or divorced.

In "The Proposal Proposal", Amy wants to know if Sheldon asked her dad about the proposal, and Sheldon says he did, "after" asking Stephen Hawking.

He was mentioned again in "The Geology Methodology". He will soon be the father-in-law of Sheldon.