Who coined the phrase 'baby boomer'?

The phrase came out of San Francisco, California. It has been thought it was Timothy O'leary to first use the phrase to give innocence to the drug culture. There was no "Baby-boom" after WWII. Actually, There was a percapita reduction in children born between 1943 and 1964. The actual percapita "Baby-boom" was in the 1800 to 1845 then again after 1964.
But, the term BABYBOOMER GENERATION has to do with the DRUG CULTURE, and the Socialistic Movement in the USA.