Ted Selker at IBM Almaden Research had an amazingly successful streak of getting useful innovations from the lab to the market with the ThinkPad, including the TrackPoint (the red joy button), the butterfly keyboard, and the transparent LCD display with removable back cover that works with an overhead projector (at a time when overhead projectors were much more common that expensive video projectors).

IBM Pointing Stick #1 - 10_25_91:

https://www.youtube.com/watch?v=H6guBllqPPY&feature=youtu.be...

(Not Edwin Selker!)

Ted Selker Oral History:

https://www.youtube.com/watch?v=Wpw7Bml_XvI

>He worked for short times at Atari and Xerox PARC before joining IBM in 1985. At IBM, first at T.J. Watson Labs, then at Almaden research labs, he rose to Fellow, inventing the TrackPoint cursor control device, making major contributions to the ThinkPad notebook computer, designing artificial-intelligence help and teaching systems, designing wearable computing devices, researching eye tracking systems, and designing an intelligent "living room of the future".

(Check out his red TrackPoint lapel pin!)

https://en.wikipedia.org/wiki/IBM_ThinkPad_760

>IBM ThinkPad 760CDV - Similar to the 760CD, this unique model had a removable back cover on the LCD that would permit light to shine through for use on an overhead projector.

IBM ThinkPad 701c "butterfly" keyboard:

https://www.youtube.com/watch?v=SLj3aCfqzOM

Opening and closing IBM ThinkPad 701c with unique keyboard folding mechanism.

ThinkPad TrackPoints - how do they work?

https://www.youtube.com/watch?v=w3A7LDyizlc

Early TrackPoint prototypes:

https://www.youtube.com/watch?v=n4Ss6F1qIHU