Linda Null

Graduate Program Coordinator
Associate Program Chair
W255 Olmsted
Department of Computer Science and Mathematical Sciences
Penn State Harrisburg
777 West Harrisburg Pike
Middletown, PA 17057

E-mail: LNull at psu dot edu
Phone: (717) 948-6089
Fax: (717) 948-6401 or (717) 948-6352

Personal Web Page

Click here to see my personal web page. (updated on March 5, 2013)

The Essentials of Computer Organization and Architecture (4th Edition)
by Linda Null and Julia Lobur

[Large view of Book] Book Web Page, including software, lecture slides,etc.
Jones and Bartlett Catalog Page, including ordering information [TextyAward Logo]
The 2nd, 3rd, and 4th editions of this textbook all won a TAA Texty Award from the Text and Academic Authors Association (in 2007, 2013, and 2015). The "Textbook Excellence Award" recognizes works for their excellence in the areas of content, presentation, appeal, and teachability.



  • Ph.D., Computer Science, Iowa State University
  • M.S., Computer Science, Iowa State University
  • M.S., School Computer Studies, Northwest Missouri State University
  • M.S.Ed., Mathematics, Northwest Missouri State University
  • B.S.Ed., Mathematics and English, Northwest Missouri State University

    Teaching Interests

    My teaching specializations are in the areas of computer security, database, and operating systems. I am also interested in computer organization and architecture. I enjoy teaching beginning programming classes.


    My main research interests are in object-oriented database systems and security, operating systems security and concurrency control, the active learning paradigm, and total quality management in the classroom. I developed a multilevel security model for object-oriented database systems and have investigated object-oriented querying and transaction concurrency. I have also done some auguring of the Internet.

    Selected Works

    One of my current research goals is to find collaborators a bit closer to home. If what I'm doing looks interesting, get in touch.

    Computer Security Links

  • SANS
  • CERT
  • The Cryptography Page
  • Secure Computing Corp.
  • IEEE Cipher
  • Bruce Schneier's Security Page
  • International Association for Cryptologic Research
  • Ron Rivest's Cryptography and Security Page
  • RSA Data Security
  • National Security Agency
  • Central Intelligence Agency
  • George Mason University - Center for Secure Info Systems