Haven’t you wondered what Of Counsel means? The new Rules of Professional Conduct of the State Bar of California (effective November 10, 2018) tell us in Comment (2) to Rule 1.0.1 “Terminology.” The definition is
The term “of counsel” implies that the lawyer so designated has a relationship with the law firm,* other than as a partner* or associate, or officer or shareholder, that is close, personal, continuous, and regular.
It’s a little strange that the definition is not in the definitions – only in the comments to the definitions.