The 1930 Harrisburg Directory lists:

Frank I. Richardson, is listed as a teacher.
Spouse, Margaret B.
He is listed as owner, address 351 S. 13th ST.

Also listed at that address:

Helen R. Richardson, cosmetician for Emerick's Marinello Beauty Salon.

F. Irvin Richardson is listed in the 1920 Census Dauphin Co. with Margaret, born 1881 & Helen, born 1913. His birth year is listed as 1916 with other possible year as 1880.

Note spelling of his middle name.