Question: Darin Adler was software  programmer that developed a Macintosh adventure game called Déjà Vu before being the Technical lead for what company's operating system release?

Context articles: William Jolitz
System 6
Lead programmer
Darin Adler
Keith Stattenfield
H1droid
TempleOS
Déjà Vu (video game)
Magic Cap
List of mergers and acquisitions by Apple

William Frederick Jolitz (born February 22, 1957), commonly known as Bill Jolitz, is an American software programmer best known for developing the 386BSD operating system from 1989 to 1994 along with his wife Lynne Jolitz.
System 6 (also referred to as System Software 6) is a graphical user interface-based operating system for Macintosh computers.
 It was released in 1988 by Apple Computer and was part of the classic Mac OS line of operating systems.
 System 6 was shipped with various Macintosh computers until it was succeeded by System 7 in 1991.
 The boxed version of System 6 cost $49 when introduced.
 System 6 is classed as a monolithic operating system.
 It featured an improved MultiFinder, which allowed for co-operative multitasking.
A lead programmer is a software engineer in charge of one or more software projects.
 Alternative titles include "development lead", "technical lead", "lead software engineer", "software design engineer lead" (SDE lead), "software development manager", "software manager", or "lead application developer".
 When primarily contributing in a high-level enterprise software design role, the title "software architect" (or similar) is often used.
Darin Adler was the technical lead for Apple Computer's System 7 operating system release.
 During 1985–1987 he worked for ICOM Simulations as primary developer of the MacVenture game engine which ran Déjà Vu: A Nightmare Comes True, Uninvited, and Shadowgate.
 Adler went on to work at General Magic and Eazel.
Keith Stattenfield is a senior Apple Computer software engineer.
 He started at Apple Computer in 1989 in the Information Systems & Technology group.
 Then worked on the Macintosh operating system starting in 1995, from the Mac OS 7.5 release on.
 He led the Netbooting project starting in Mac OS 8.6, and then served as the overall technical lead of Mac OS 9.
 His California license plate reads "MAC OS 9".
The H1droid project started when Vodafone sold Samsung H1 mobile phones running on LiMo operating system.
 Mobile phones running with the LiMO operating system were so few that only a few applications were also available.
 With this limitation, Samsung H1 owners wanted to run the phone with the more famous Android operating system since the phone itself had good hardware attributes.
 LiMo operating system also shared other characteristics as Android which could be a good platform for operating system transformation.
 With this idea, a group of software enthusiast shared ideas on blogsites from all over the world and developed the H1droid and distributed it on the Internet.
 The software is still on the development stage with a few bugs and it is ongoing.
TempleOS (formerly J Operating System, SparrowOS and LoseThos) is a biblical-themed lightweight operating system created over the span of a decade by the American programmer Terry A. Davis.
 The software is a x86-64 bit, multi-tasking, multi-cored, public domain, open source, ring-0-only, single address space, non-networked, PC operating system for recreational programming.
 The operating system was designed to be the Third Temple according to Davis and uses an interface similar to a mixture of DOS and Turbo C.
 Davis describes the operating system as a modern x86-64 Commodore 64 with a variation of C (named HolyC) in place of BASIC.
Déjà Vu is a point-and-click adventure game set in the world of 1940s hard-boiled detective novels and movies.
 It was released in 1985 for Macintosh – the first in the MacVenture series – and later ported to several other systems, including the Amiga.
 Subsequent releases featured improved graphical features, including color.
Magic Cap (short for Magic Communicating Applications Platform) is a discontinued object-oriented operating system for PDAs developed by General Magic.
 Tony Fadell was in charge of the platform.
 Darin Adler was an architect.
Apple Inc. is an American multinational corporation that designs and manufactures consumer electronics and software products.
 It was established in Cupertino, California, on April 1, 1976, by Steve Jobs, Steve Wozniak, and Ronald Wayne, and was incorporated on January 3, 1977.
 The company's hardware products include the Macintosh line of personal computers, the iPod line of portable media players, the iPad line of tablets, the iPhone line of smartphones, the Apple TV line of digital media players, and the Apple Watch line of smartwatches.
 Apple's software products include the OS X operating system, the iOS mobile operating system, the tvOS operating system, the watchOS operating system, the iTunes media browser, and the iLife suite of multimedia and creativity software.
 As of 2017 , Apple is publicly known to have acquired 70 companies.
 The actual number of acquisitions is possibly larger as Apple does not reveal the majority of its acquisitions unless discovered by journals.
 Apple has also purchased stakes in two companies, as well as made two divestments. Apple has not released the financial details for the majority of its mergers and acquisitions.