The Marshall Shingle Company in Oakland was owned by Harvey’s Step-Father. Harvey worked for his stepfather at the Shingle Company in February 1953, according to the timeline you see below.
In 1956, there was a suspicious fire at the Shingle Company as documented in the article below found on http://www.newspapers.com.
Below is Edward E. Marshall’s obituary. It claims he died one week after he had surgery on his leg. He was 77 years old.