Question: NLS, or the "oN-Line System" was designed by which American engineer?

Context paragraphs:
NLS (computer system): NLS, or the "oN-Line System", was a revolutionary computer collaboration system from the 1960s.  Designed by Douglas Engelbart and implemented by researchers at the Augmentation Research Center (ARC) at the Stanford Research Institute (SRI), the NLS system was the first to employ the practical use of hypertext links, the mouse, raster-scan video monitors, information organized by relevance, screen windowing, presentation programs, and other modern computing concepts.  It was funded by the Defense Advanced Research Projects Agency, NASA, and the U.S. Air Force.

Charles Irby: Charles H. Irby was the chief software architect on SRI International's oN-Line System (NLS) that was used in The Mother of All Demos, which established many of the user interface standards that exist today, and also lead the design group for the Xerox Star.  He co-founded Metaphor Computer Systems and lead the design of its products.

SDS 940: The SDS 940 was Scientific Data Systems' (SDS) first machine designed to support time-sharing directly, and was based on the SDS 930's 24-bit CPU built primarily of integrated circuits.  It was announced in February 1966 and shipped in April, becoming a major part of Tymshare's expansion during the 1960s.  The influential Stanford Research Institute "oN-Line System" (NLS) was demonstrated on the system.

Douglas Engelbart: Douglas Carl Engelbart (January 30, 1925 – July 2, 2013) was an American engineer and inventor, and an early computer and Internet pioneer.  He is best known for his work on founding the field of human–computer interaction, particularly while at his Augmentation Research Center Lab in SRI International, which resulted in creation of the computer mouse, and the development of hypertext, networked computers, and precursors to graphical user interfaces.  These were demonstrated at The Mother of All Demos in 1968.  Engelbart's Law, the observation that the intrinsic rate of human performance is exponential, is named after him.

Corliss Orville Burandt: Corliss Orville Burandt is an American engineer who invented a system of variable valve timing in automobile engines.  Working through a 1965 Chevrolet Corvair, he designed a system of putting a sensor into the cylinder to optimize the fuel-air mixture during combustion.  He claims that the hybrid autos which are on the market today use technology from his patents.

IBM 473L Command and Control System: The IBM 473L Command and Control System (473L System, 473L colloq. ) was a USAF Cold War "Big L" Support System with computer equipment at The Pentagon and, in Pennsylvania, the Alternate National Military Command Center nuclear bunker.  Each 473L site included a Data Processing Subsystem (DPSS), Integrated Console Subsystem (ICSS), Large Panel Display Subsystem, and Data Communications Subsystem (Automatic Digital Network interface: "AUTODIN Data Terminal Bay").  The "System 473L" was an "on-line, real-time information processing system designed to facilitate effective management of USAF resources, particularly during emergency situations" e.g., for: "situation monitoring, resource monitoring, plan evaluation, plan generation and modification, and operations monitoring".  In 1967, the 473L System was used during the "HIGH HEELS 67" exercise "to test the whole spectrum of command in a strategic crisis".

Burrell Smith: Burrell Carver Smith (born December 16, 1955) is an American engineer who, while working at Apple Computer, designed the motherboard (digital circuit board) for the original Macintosh.  He was Apple employee #282, and was hired in February 1979, initially as an Apple II service technician.  He also designed the motherboard for Apple's LaserWriter, and designed a low-cost version of the Apple II that eventually became the Apple IIe, using the same innovative design techniques that he pioneered with the Mac.

John Henderson (engineer): John Henderson is an American engineer, United States Army engineer officer, and government official.  He is President Donald Trump's nominee to become Assistant Secretary of the Air Force (Installations, Environment & Energy).  Prior to his nomination, Henderson most recently served in the U.S. Army as the Commander of the Omaha District, Army Corps of Engineers.  He has over 23 years of active military experience as an Army engineer officer, including serving two combat tours to Iraq and one combat tour to Afghanistan as an engineer battalion task force commander.

Jack McCauley: Jack McCauley is an American engineer, hardware designer, inventor, video game developer and philanthropist.  He designed the guitars and drums for the Guitar Hero video game series and was an engineer at Oculus VR, which was later acquired by Facebook for $2 billion.  At Oculus McCauley worked on the team that designed and built the Oculus DK1 and DK2 virtual reality headsets.

Walt Braithwaite: Walt W. Braithwaite is a Jamaican born American engineer and former executive at Boeing.  He joined the company in 1966 as an associate tool engineer in the Fabrication Division.  In 1975 he was the senior engineer responsible for developing Boeing's use of computer technology by using CAD/CAM in the design of commercial airplanes.  Over the next several decades Braithwaite's teams oversaw the engineering development of the 707,727,737 and later as head of engineering operations for the 747, 767 programs and the 777, the first commercial aircraft to be designed entirely with computer-aided design.  In 1994, Braithwaite was named vice president of all information systems activities for Boeing Commercial Air-plane Group.  In 2000 Boeing named Braithwaite President of Boeing Africa, responsible for overseeing corporate activities in the region and acting as an ambassador and liaison between local governments and Boeing divisions in the region.  After 36 years with Boeing, Braithwaite retired in 2003 as the highest-ranking black executive in Boeing's history.

Supporting paragraphs: NLS (computer system) Douglas Engelbart
Answer: Douglas Carl Engelbart