I am a software engineer for IBM and I've been working for more than 30 years with the Transaction Processing Facility (TPF) family of products:
[[http://www-03.ibm.com/software/products/en/ztransaction-processing-facility| IBM's TPF page]]

When I first started, the product was called the Airline Control Program and was given away to mainframe computer customers!
[[http://en.wikipedia.org/wiki/IBM_Airline_Control_Program| ACP wiki page]]

I have also been an adjunct professor at another nearby college for several years.