Arnie crossed the street to WMEX in 1960. This was a big deal. He was breaking singles by 1961. Notably "Does Your Chewing Gum Lose Its Flavor on the Bedpost Overnight" by British skiffle artist Lonnie Donegan. This was the top-40 phase of his career and he was quite literally number one. He was on air 7 days a week... though that 7th show was pre-recorded. More here.
In 1966 he screwed up a bit. He jumped to WRKO-AM and they got smacked with the non-compete clause in his WMEX contract. In his defense this is something that still comes up today. Basically it's legally dubious for a contract to take away someones right to make a living. [more here] Interestingly, in this case WRKO fought the contract for 18 months and lost. Ginsburg was off air as of May 1967. He got lucky and they moved him into sales. They could have fired his ass.
But in the end, Arnie turned out to be good at that too. He went into a series of desk jobs: In 1970 he became the GM of WBCN, an AOR station. In 1972 GM at WWEL-AM, and part owner of WXKS-AM in 1979. He did all that while doing a little oldies show back on WMEX-AM on Saturday nights and a weekend shift on WROR. IN 1984 with Pyramid broadcasting he purchased WVJV-TV Channel 66. (some courses incorrectly cite the calls as WDJD.) This was a fascinating experiment that was also a total business failure. They sold the station in 1986.
Arnie "Woo-Woo" Ginsburg retired just a little while after that. He was inducted into the Massachusetts Broadcasters Hall of Fame in 2008. He is known to make the trip back into Boston to make guest radio appearances.