Faculty | Computer Science Major | Concordia University Irvine

Assistant Professor of Mathematics


As an undergraduate, Dr. Croll participated annually in the Carleton College Summer Mathematics Program for Women, which encourages women who are gifted in mathematics to pursue higher degrees. Professor Croll’s doctoral research area was in commutative algebra. In particular, her interests lie in homological algebra, maximal Cohen-Macaulay modules, and Gorenstein rings. Her non-mathematics hobbies include biking, traveling, reading, and playing with her cats.


  • University of Nebraska-Lincoln, Ph.D. 2013

Department Chair
Professor of Mathematics


Professor Julie Melberg joined the Concordia mathematics faculty in 2010, after teaching high school mathematics for several years. She received her Bachelor of Arts in Mathematics degree from Wittenberg University in Springfield, Ohio; her Master of Arts in Mathematics degree from California State Fullerton and is currently pursuing her Ph.D. in Mathematics Education from Curtin University. Professor Melberg enjoys teaching mathematics at CUI, teaching Core Mathematics classes as well as courses for the Mathematics major. Her teaching and research focus on inquiry-based learning and encouraging students to develop life-long thinking skills.


  • California State University, Fullerton, M.A. 2000

Professor of Mathematics

“I felt very motivated when I came back to Concordia [to teach],” Dr. Melinda Schulteis says. "I wanted to connect students to local and national mathematics conferences so they could get research experiences as undergraduates.” Dr. Schulteis is proud that CUI now regularly takes students to mathematics conferences as participants and speakers.


  • University of California Irvine, Ph.D. 2004

Assistant Professor


Professor Joshua Tallman joined the Concordia University faculty in 2019 as part of the Computer Science Department. He holds a Master's degree in Computer Science from Johns Hopkins University with a BA in Computer Engineering. Professor Tallman has 15+ years of experience working as a programmer and analyst in the field of computer security. He has held positions within the Department of Defense working in Maryland, Germany, and the United Kingdom, as well as working as an independent contractor for Dragos, Inc., a company specializing in security for Industrial Control Systems. Professor Tallman wants his students to understand their study and vocation as a means for advancing the Great Commission. He strives to make learning and work as enjoyable as possible.

Education & Technical Skills

Master of Science in Computer Science - John Hopkins University (2009)
Bachelor of Science in Computer Engineering - University of Pacific (2004)

  • Programming in Windows/Unix environments with C/C++/C#, Python
  • Programming with SQL (experienced) and Ruby, and Hadoop MapReduce
  • Microsoft Win32 system level programming and x86/64 assembly
  • Code analysis with WinDbg, IDAPro, and other custom analysis tools


Contractor/Consultant, Dragos, Inc., 2016 - current

Independent contractor designing computer security products for Industrial Control Systems equipment

  • Create key components of Dragos’ backend analytic engine including a time series forecaster using machine learning and a data aggregation warning system
  • Implement analytics for detecting suspicious computer security events

Regional Director, CSB Ministries, 2017 - current

Building godly men of today and tomorrow through the local church

  • Serve churches that partner with our ministry through training, leadership, and consultation
  • Grow the ministry by partnering with new churches and like-minded organizations
  • Oversee regional events such as summer camps and leadership conferences
  • Oversee curriculum development for church leader guides and student workbooks

Adjunct Faculty (e.g., Lead Course Instructor), Department of Defense, 2006 - 2010

Organized, lectured, and developed 80-hour course on the Windows internal subsystems.

    • Total classes numbered 100+ students including guests from partner agencies and allied nations.
    • Created lecture and lab materials on the security subsystem, DLL injection, MS-RPC, etc.

Computer & Network Vulnerability Analyst, Department of Defense, 2004 - 2017

Protected computer networks by researching, demonstrating, and mitigating security vulnerabilities

      • Discovered critical vulnerabilities in the design and implementation of common operating systems; created 16 proof-of-concept security tools to demonstrate specific threats
      • Designed and guided the creation of large scale Computer Network Defense (CND) tradecraft
      • Frequently engaged with customers up to and including the General Officer level; influenced decisions that improved the overall cyber defense capabilities of USA and allied nations
      • Presented vulnerability research at 6 international DoD sponsored cyber security conferences
      • Supervised small team in network security, malware forensics, and incident response
      • Deployed to sensitive facilities in multiple theaters including hostile zones

Whitewater Rafting Guide, Whitewater Excitement, 1999-2004

Guided rafts and led daily operations for summer whitewater rafting expeditions on class III-IV rivers.

    • Trained and certified junior guides at the annual Whitewater Excitement Guide School

Professor of Mathematics


Dr. Bret Taylor is proud to be a member of the CUI Mathematics department. Since arriving at CUI in 1997, Dr. Taylor has taught a variety of mathematics classes, education courses and classes in the Christ College church-work program. Building on his ten years of teaching junior and senior high school mathematics, Dr. Taylor completed his doctoral degree from Curtin University in Perth, Australia in 2004 focusing on mathematics anxiety and classroom environment.

“If I were to say you can work each day with young people excited and energized about life and their future, investigate and think about the great questions and ideas of all time, and hear God's Word of love and forgiveness each day....wouldn't that sound like a great place to work? That is why I work at Concordia University Irvine!"


  • Curtin University, Perth, Western Australia, Ph.D. 2004

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