He also came from the world of big banks:

According to Bloomberg, Blummer worked as an analyst at Deutsche Bank AG from 1996 until 2012, when his LinkedIn page notes that he joined Morgan Stanley as an executive director in Budapest. His first official career foray into Bitcoin came with CoinTerra in 2014.

Up until his passing, Blummer remained active in the Bitcoin world. For instance, he published an article about flaws in the central banking system to Medium on December 16, 2019.

“The central bank is never short of cash, since it creates it,” Blummer wrote in what would be his final public argument in favor of a decentralized financial system. “That is what the Fed engages in increasing hundreds of billions since September 2019. Doing so however sends a signal to the market, that there is not enough cash for everyone. This is like blood in the water for the predators who have thereby the confirmation that some banks struggle and either have to pay high interest rate for short term cash or liquidate their bag of treasuries at depressed prices.”
https://www.nasdaq.com/articles/remembering-tamas-blummer-pioneering-bitcoin-developer-2020-01-15