Michael Vaughn is a member in good standing with the State Bar of California and is licensed to practice before all of the courts of the State.
His official California State Bar Number is 79661.
The California State Bar maintains a web site at which you can check the current status of all California attorneys. You may check Mr. Vaughn’s status there, but then you will have to manually return to this site
State bar site: http://members.calbar.ca.gov/search/member.aspx