I worked my first professional job, as a Machine Designer in the R&D department of a multinational manufacturer of food and chemical machinery, for about 11 years (this includes credit for my co-op time while I was in school). Three years before I left there, the company became an early investors in CAD/CAM software (this was in 1977) and for those last three years I did virtually all of my work on the system including programming a lot of custom utilities which enhanced our workflow and leveraged what the system was able to do for our type of work. At the end of this period, in 1980, I decided to change careers (well sort of). I quit my job, put my fully-vested defined-benefit pension in the 'bank' as it were (which I started to collect when I turned 65 last year), sold my house, packed-up my wife and three sons and moved from Michigan to SoCal and went to work for the company that had sold us the CAD/CAM system in the first place. For seven years I worked in the sales organization first as an AE (Application Engineer, AKA 'demo-jock') and eventually as a regional technical manager after being transferred back to Michigan to head-up the technical side of a major sales effort which I worked on for nearly a year and half. After we had been awarded the sales contract I was asked to join the development organization to help make sure that we were working on the correct stuff so that we could keep the $100,000,000 piece of business that I had just been a part of winning (we made of lot of promises to nail down the contract), which necessitated moving BACK to SoCal where our R&D operation was headquartered. I've been part of the R&D operation ever since, currently working in the Product Marketing group (not to be confused with traditional 'Marketing' where they do adverts and public relations campaigns).
So in my 42 year (46 counting my co-op time) career I guess you could say that I've changed 'careers' twice (although the last change, Sales -> R&D, was internal) and have never looked back. Granted, these changes were each built on a foundation that had been established in the previous job that I had been doing so this might not appear to be as drastic as what some of my friends from engineering school did after graduation, two of which are now medical doctors and one who recently retired from the CIA.
So for what it's worth, if you think that the new, contemplated career more closely matches what your CURRENT goals are (NOT the ones that you may have had when you first left school), then I'd go for it. If you don't, 15 or 20 years from now you'll look back and wonder what your life would have been like if you had taken the plunge and if your situation did not turn as well as you had hoped that it would, you'll make yourself, and your family, miserable, just putting in your time waiting for either retirement or a pink-slip. As I said before, I thank God I made the decisions that I did, when I did, and I'm not sure that if given a second chance, that I would have done anything differently. Life is too short (or long, depending on your point of view) to spend your life second guessing what you did or did not do, so the best advise that I can give is to make a decision one way or the other, but once you have, go out and make the most of it otherwise you will always feel like you missed the target somehow.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
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