Steve Wozniak designed a piece of technology.
Apple I . It was designed and hand-built by Steve Wozniak . Stephen ( or Stephan ) Gary Wozniak ( [ ˈwɒzniæk ] , born August 11 , 1950 ) , nicknamed `` Woz '' , is an American inventor , electronics engineer , programmer , philanthropist , and technology entrepreneur who co-founded Apple Inc. . He is known as a pioneer of the personal computer revolution of the 1970s and 1980s , along with Apple co-founder Steve Jobs . Wozniak single-handedly developed the 1976 Apple I , which was the computer that launched Apple . He primarily designed the 1977 Apple II , known as one of the first highly successful mass-produced microcomputers , while Jobs oversaw the development of its unusual case and Rod Holt developed the unique power supply .