Not much on that name out there......
This Samuel L Waller was b. in CA 1866 or 67 son of Leopold and Fannie Waller. Later lived in NY with parents by 1905 (see link below) and then sister Jessie. Listed as a Civil Engineer on census' that can be viewed on-line.
Citing this Record: "United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9GW-PP3
1900 ED 203 Precinct 2 San Francisco city Ward 40, San Francisco, CA
Head Leopold P Waller M 62 Apr 1838 NY marr 34 yrs
Wife Fannie Waller F 54 Dec 1846 Ger
Son Samuel L Waller M 34 June 1866 CA Civil Engineer
Dau Jessie W Jeman F 32 Apr 1868 CA widow
Citing this Record: "United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MN6R-5ZQ
Leopold P Waller M 31y NY
Frances Waller F 20y Prussia
Samuel E Waller M 4y CA
Jessie J Waller F 2y CA
Julian L Waller M 6m CA
Lena Leventhal F 18y Prussia
Many more results on the above families at: