Geoffrey D. Decker, BA, MS
Instructor | IBM Champion 2022-2025 | Open Mainframe Project Ambassador and Member of the Governing Board | NIU Ally               

Northern Illinois University

Department of Computer Science

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General Announcements:

Be sure to check Blackboard Academic Suite at webcourses.niu.edu for your class and section!

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Spring 2026 Teaching Schedule:

CSCI 360-1 - Computer Programming in Assembler Language:  11:00 AM-12:15 PM on MW in Psychology-Computer Science (PM) 103.

CSCI 360-PE1 - Computer Programming in Assembler Language:  10:00 AM-12:30 PM on T in TBD at Harper College.

CSCI 428-1/524-1 - Advanced Android Mobile Device Programming:  9:30-10:45 AM on MW in Psychology-Computer Science (PM) 110.  

CSCI 465-1 - Enterprise Application Environments:  2:00-3:15 PM on MW in Psychology-Computer Science (PM) 253.

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Spring 2026 Office Hours:

8:30-9:30 AM and 1:15-2:00 PM on MW in PM 463 and 12:30-1:30 PM on T at Harper College. Also by email and appointment.

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Contact Information:

Campus Address:

      Geoffrey D. Decker, BA, MS
             Northern Illinois University
Department of Computer Science
             DeKalb, IL  60115-2854 

Office Information:

             Office:  PM 463 (NIU)
             email:  gdecker@niu.edu
             Phone:  815.753.7204
             Department Phone:  815.753.0378