I checked two newspaper subscription sites for any news on Ronald Blatt in CA in 1955 and came up empty. You might want to check through the central library in LA in their City Directory for that year to see if it shows where he was working. There was a hospital in Inglewood in use during this period -- called Inglewood Hospital. I also did a search in the CA birth indexes on that specific date with the surname Landry and did not get a hit. Just in case, I also tried Blatt....nothing.

Sorry.