Dr. Zarkos has teaching and research interests in the areas of Corporate Finance, Financial Management, Capital Budgeting, Real Options, Management Accounting and Strategy. 

His research focuses on new applications of real options in management decision making and the development of decision techniques that can be used to solve various problems encountered in Corporate Finance and Strategy literature. Recent examples of his research include the utilization of real option theory in selecting the optimal product mix under conditions of production constraints and demand uncertainty, and the use of real options in comparing mutually exclusive special orders with unequal lives. Dr. Zarkos has previously taught the subject of Financial Markets and Institutions at the Manchester School of Management and became a certified lecturer after successful completion of the teaching training program offered by the staff development unit of University of Manchester Institute of Science and Technology. 

Dr. Zarkos has undertaken consulting work at Tegopoulos/ENET S.A. with main responsibilities the design of e-commerce applications in the financial services sector and the development of fundamental and technical analysis expert system available to internet. He has also provided consulting service to ICAP S.A in Athens and has produced several market reports in various sectors of the Greek economy. He is an associate member of the Chartered Institute of Marketing (CIM) and is also a part-qualified management accountant at the Chartered Institute of Management Accountants (CIMA) in UK. He is Vice president of the Hellenic Association of Financial Managers and member of the supervisory board of ICAP.