J. Michael "Mickey" Haller (d. 1970) was the father of Harry Bosch and Mickey Haller, and the grandfather of Maddie Bosch and Hayley Haller. He was a famous criminal defense attorney, a registered Democrat, and lived on Canon Drive in Beverly Hills.
He once "handled one of the Manson girls," and in the late 1950s, he "won an acquittal for the so-called Highwayman." He represented prostitute Marjorie Lowe on six loitering arrests between 1948 and 1961, and later filed all of the paperwork for Lowe to try to regain custody of her son.
Haller did not meet Bosch until the man was on his deathbed, and revealed that Harry had a half-brother.