Listen to Bob “Mr. 64-Bit” Rogers' history “from start to finish” in his own words, as well as the history of the IBM Mainframe...literally. Bob worked 43 years for IBM as a mainframe OS developer and as a lead software designer when IBM developed their 64-bit z/Architecture in 2000. Bob officially retired in 2012, but has found it hard not to keep himself busy with work of his own choosing. As you can imagine, his stories and knowledge seemingly have no limit.
For more great information about Bob and IBM, read the article linked below:
https://blog.share.org/Article/making-history-at-ibm-with-bob-rogers