Hi Christine, The only additional info that I found was A Soren Peter Callesen was living on September 12, 1918 at 121 W. Seventh St., Concordia, Cloud Co., Kansas. Born=5 May 1874 Citizenship=Naturalized Occupation=telephone trouble [repair] man, United Telephone Co., Concordia Nearest Relative=United Telephone Co., Concordia Source=World War I Draft Registration Cards 1917-18.
I tried to find his death info on-line but didn't.You might want to contact the San Diego Genealogical Society, rootsweb.ancestry.com/~casdgs/sdresources.shtml who does research. Ironically you have to have his death date before you can order a copy of his death certificate from the County or find his obituary (if one was published). Successful Searching!