If it's not too nosy, when did you work for a timesharing vendor? I did that briefly, in 1969-70. I left to return to MIT.
Actually two. The first was First Data in Waltham, MA. I worked part time in the NYC office when I was in college in 1976 and 1977, then full time from Sept 77 to June 78. After our computer room burned down, (I can testify that when you drop a PDP-10 from the 4th floor to the basement, it does not reboot) we were bought by ADP Network Services. Things got ugly and I bailed.
Then in 1980 the consulting company I worked for, Lambda Technology, was bought by GE Information Services Co in Rockville, MD. Their primary product ran on Honeywell machines, but they started a new venture using IBM mainframes which was what I worked on. For the next few years I did a few projects with them. Then things got ugly and I bailed to another small consulting company.