Dr. Everard Weller had been with ACME since the beginning, when the agency was only a small private training facility.
Back then, ACME was known as "A.C.M.E." an acronym that stood for "Academy for Combat Mission Enhancement". Today, it is simply ACME, with no dots in between the letters to force erase the notion that it ever stood for anything.
As time passed and different ACME Chiefs came and went, Dr. Weller recently decided that he would become "Chief" Weller, and begin aiding agents more closely.
Personality
In his life, Chief Weller had been nearly everything from Archeologist to Zoologist. He frequently lectured at the nearby academy and had earned himself countless honorary degrees. The one thing he pride himself in, despite his achievements, was his ability to read people.
Aspirations
To see all his students, directly or indirectly, reach the highest quality of life they can achieve.
You know, I think the Netflix Carmen would have been better if they had done good flashbacks. Carmen was a teen right? Why not do flashbacks of when Carmen and Chase were partners and working together? Or when Chase was chasing Carmen? Or more about when Carmen quit?