JK Scheinberg

John D. Kullmann "JK" Scheinberg (born December 10, 1954) was a project manager and senior engineer at Apple Computer who is known for initiating the Intel port of Mac OS X.

Education
Scheinberg began his studies in computer science at from 1975 to 1979, and then transferred to, where he received his B.S. in 1980 while also working at  in.

Apple Computer
Scheinberg joined Apple Computer in 1987 as a product development director on A/UX, and then AIX, both based on derivatives of Unix. His first hire was Joe Sokol, who eventually became his supervisor. In June 2000, Scheinberg sought an independent project so that he could work from home closer to his parents after the birth of his son. He requested approval to port the Mac OS X kernel to allow it run on Intel processors. In December 2001, he demonstrated Mac OS X booting successfully on PCs to Bertrand Serlet, the senior VP of software engineering. By that evening, a top-of-the-line Sony laptop was picked up from the local  store and Scheinberg was able to get it to run Mac OS X. The next morning, Apple CEO Steve Jobs took the Vaio with him on a flight to meet with, the president of Sony, for a potential deal. However, Sony's development team had already finished optimizing the Vaio to run Windows and declined Apple's offer to have Mac OS X to run on their hardware.

In January 2002, two more engineers were assigned to the project, codenamed "Marklar", which was kept so secret that only six people at Apple were aware of its existence at the time. By August 2002, about a dozen more employees were assigned to it. At the 2005 Worldwide Developers Conference on June 6, Jobs reveals that Apple had been secretly maintaining an Intel-compatible version of Mac OS X and would begin a transition to Intel processors from 2006 to 2007. Scheinberg retired from Apple in 2008.

After Apple
After launching some startup companies, Scheinberg applied for a Genius Bar position at an Apple retail store, where he noted that the majority of interviewees were half his age. After being told "We'll be in touch", Scheinberg said he never heard back from the store management. His predicament was later covered in a  story about.