My interest in fiscal policies and fiscal-structural issues originates from my time at the Fiscal Council of Hungary in 2009 and 2010. Among others, I developed projection methodologies of public revenues, and together with Antonia Huttl we invented a novel methodology to estimate government finance statistics of the national accounts based on the budget.
Since 2016 I have been assisting the Lithuanian Fiscal Institution (Budget Policy Monitoring Department of the National Audit Office) as a member of their Advisory Panel on numerous fiscal issues. Moreover, between September 2017 and April 2018 I also served as an external advisor to the Independent Authority for Fiscal Responsibility and provided advice on modeling the macroeconomic impact of pension reforms.
Useful reading material on fiscal councils are available on the website of the EU independent fiscal institutions, and you might wish to check out the IMF's Fiscal Council Dataset as well.