Photograph of Ellis Horowitz taken November, 2012
New York City, United States
|Residence||Pacific Palisades, California, USA|
|Alma mater||University of Wisconsin–Madison|
|Known for||Data structures and algorithms|
|Institutions||University of Southern California|
|Doctoral advisor||George E. Collins|
Ellis Horowitz is an American computer scientist and Professor of Computer Science and Electrical Engineering at the University of Southern California (USC). Horowitz is best known for his computer science textbooks on data structures and algorithms, co-authored with Sartaj Sahni. At USC, Horowitz was chairman of the Computer Science Department from 1990 to 1999. During his tenure he significantly improved relations between Computer Science and the Information Sciences Institute(ISI), hiring senior faculty, and establishing the department's first industrial advisory board. From 1983 - 1993 with Lawrence Flon he co-founded Quality Software Products which designed and built UNIX application software. Their products included two spreadsheet programs, Q-calc and eXclaim, a project management system, MasterPlan, and a floating license server, Maitre D. The company was sold to Island Graphics.
- B.S. (Mathematics) Brooklyn College, 1964.
- M.S (Computer Science) University of Wisconsin–Madison, 1967.
- Ph.D. (Computer Science) University of Wisconsin–Madison, 1969.
Horowitz has been actively engaged as an expert witness testifying in numerous peer-to-peer file sharing legal cases. Generally he has represented the copyright owner, including individual record companies, the Recording Industry Association of America, and the Motion Picture Association of America. His testimony has been cited numerous times in various decisions and orders, in particular:
- Horowitz was cited in the Arista Records LLC v. Lime Group LLC case.
- His testimony was also cited in RIAA versus MP3tunes.
- In several BitTorrent cases including MPAA versus isoHunt.
More recently, Horowitz has represented Universal Music Group (UMG) and others against the music streaming service Grooveshark.com. Summary judgment was awarded to UMG, with the decision citing Horowitz' expert reports.
In 1999 Horowitz was appointed Director of Information Technology and Distance Education in USC's Viterbi School of Engineering. Part of his responsibilities included their satellite-based closed circuit instructional network. He renamed the organization USC's Distance Education Network (DEN) and moved course delivery from satellite to the Web. DEN currently offers numerous graduate level courses leading to Masters degrees, primarily in computer science and electrical engineering. In 2000 he received an outstanding distance education educator award from R1edu.org.
Ellis Horowitz has published numerous technical articles  and several books, including:
- 1975. Practical Strategies for Developing Large Software Systems, Addison-Wesley Publishing Co., March 1975. ISBN 0201029774.
- 1984. Fundamentals of Computer Algorithms. With Sartaj Sahni, Computer Science Press, division of W.H. Freeman, New York 1984.
- 2007. Fundamentals of Data Structures in C. 2nd Ed. With Sartaj Sahni, Susan Anderson-Freed Computer Science Press, division of W.H. Freeman, New York, 2007. ISBN 0929306406.
- A Remarkable Trajectory: From Humble Beginnings to Global Prominence, George A. Bekey, 2015, pp. 260-262, ISBN 1511619260
- Spreadsheets under Unix/X, Feb. 10, 1993
- Ruling in EMI v. Escape Media Group -  items 21, 35–37.
- Memorandum & Order Capitol Records et al v. MP3Tunes et al. , see pp. 3, 4, 22, 26.
- Order Granting Plaintiff's Motion for Summary Judgement. , see pp. 3, 4, 6, 8, 21, 40–42. (Mentions Horowitz in numerous places; see especially the footnote on page 4 admitting Horowitz' testimony.)
- United States District Court, Southern District of New York Opinion in 11 Civ. 8407. .
- Distance Education Network, United of Southern California, USA.
- R1edu Awards.
- horowitz&qp=H1.50:F1.4:F2.4:F3.4:F4.3 Ellis Horowitz, DBLP. Retrieved 27 September 2014.