Since June 2006 Issing has been president of the Center for Financial Studies (CFS) at the Goethe University in Frankfurt am Main and from 2007 until 2018 he was an international advisor to Goldman Sachs.
In 2008 Issing was also a member of the high level group of the European Commission on financial supervision in the EU chaired by Jacques de Larosière.
He was a Member of the G20 Eminent Persons Group on Global Financial Governance, which was formally established by G20 Finance Ministers and Central Bank Governors for the period 2017–2018.
The ECB had "crossed the Rubicon" and was in an untenable position, struggling to carry out its conflicting roles as agent of monetary policy, banking regulator, and Troika enforcer.
Noting that the bank already held over €1 trillion of bonds bought at artificially low or negative yields, so would face great losses when interest rates rise again, he warned.