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John Tsakatanis has a diverse range of work experience in the finance field. John started their career as an Accountant at ABH Medical Group in July 2012 and worked there until August 2015. After that, they joined Taxpedia Consulting as a Financial Consultant in October 2010 and worked there until December 2015. In January 2016, John joined Workable as an Accountant and later transitioned to the role of Financial Systems Analyst in April 2018. John then became the Director of Financial Systems in July 2018 and worked in that position until March 2021. In 2019, John co-founded Tech Finance Network and is currently serving as a Co-Founder. John'smost recent role is at Hack The Box, where they started as a Director of Finance in March 2021 and is currently serving as the VP of Finance since January 2023.

John Tsakatanis has a diverse education history. John obtained a Bachelor of Science (BS) degree in Accounting and Finance from Athens University of Economics and Business, starting their studies in 2004 and completing them in 2009. Following this, they pursued a Master of Business Administration (MBA) from Alba Graduate Business School, studying from 2012 to 2014.

In terms of certifications, John obtained the NetSuite Certified SuiteAnalytics User certification from NetSuite in September 2018. John also received the A' Class certification from the Economic Chamber of Greece in January 2010.

Recently, in 2020, John completed a course titled "Python for Managers" at Columbia Business School.

Based on the provided information, no specific degree name is mentioned for their course at Columbia Business School.