'in his background' is correct and usable in written English. You can use it to refer to a person's history or past experiences. For example, "Billy was successful in business, but he had a troubled past in his background.".
Unfortunately, in his background that's not true".
"Maybe that's the boxer in his background".
There is certainly a darkly wretched streak in his background.
One explanation can be found in his background.
What he's been accused of, there's just none of it in his background".
Engel boasts that he has nothing military whatever in his background.
With some training as a conductor in his background, he decided to take up the baton.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia