MacKenzie was the creator of the unique style of bunkers you see at CPC and other California courses, but when Tommy Naccarato posted some early black and white photos of courses by Bell, Hunter and Behr it seemed to me that MacKenzie wasn't the creator of that style, rather, possibly Hunter, Bell, Thomas, Behr, Macbeth or Watson.
MacKenzie's first California course isn't until 1927, and then in conjunction with Hunter.
Hunter's first California course is in 1921, six years before MacKenzie puts a shovel in the ground.
In addition he designed California courses in 1927 and 1928.
Behr's first California course is in 1920 with others in 1922 and 1924, again, years before MacKenzie's efforts
Bell's first California course is in 1921, with others in 1922, 1923, 1925 and 1926, again, years before MacKenzie begins his California designs.
Thomas's California designs start in 1921 and continue in 1924, 1925, 1926 and 1927.
Macbeth's California courses date to 1911 and 1919.
Watson's California courses date to 1923 and 1928
Bell and Thomas worked together in the early 1920's.
MacKenzie worked with Hunter.
So, who crafted that unique style of California bunker ?
It certainly doesn't appear to be MacKenzie.