About Us

About Charles John Kathrein, MSSM

Charles John Kathrein, MSSM, is Owner and Managing Member Mustang Technologies LLC is a Minnesota based Provider of Accounting, Bookkeeping, Consulting and Training Services for QuickBooks® Online; Strategic Advisory Services; and Tax Services to Self-Employed, Startup Founders and Small Business Owners

Mr. Kathrein is a QuickBooks Online Certified ProAdvisor.

Mr. Kathrein is Co-Founder, Chairman and Chief Financial Officer, Kathrein Ventures Pte Ltd, a Singapore based Angel/Seed Investor.  Kathrein Ventures provides ‘seed’ capital to technology startup companies; and, provides business consulting and mentoring services to technology startup companies, primarily in the key areas of Sales Forecasting (Sales Funnel) and Cash Flow Forecasting.

Kathrein Ventures was recently names among the 50 Best Venture Capital Firms in Singapore 2019 by DrWealth.

Mr. Kathrein has more than 30 years of experience working in Asia and more than 40 years of experience in the Communication, Information Technology, Logistics and Maintenance Management sectors.

Mr. Kathrein is a retired United States Marine Corps Major and a Vietnam War veteran.

Mr. Kathrein holds a Master of Science in Systems Management from the University of Southern California, a Bachelor of Science in Business Administration from Roosevelt University, and a Certified Public Accountant Certificate from the University of Illinois. 

Mr. Kathrein is past Governor, American Chamber of Commerce in Thailand.


 Certified QuickBooks Online Proadvisor

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