United Nations
In New York he served as Slovenia permanent representative. He was also active in the UN International Law Commission, where he served several terms and chaired it for one year.

International authority
Petrič work is persuasive because his diplomatic offices are not separate from his academic foundation. Foreign policy is, for him, a legal, historical and human discipline.

In New York he served as Slovenia permanent representative. He was also active in the UN International Law Commission, where he served several terms and chaired it for one year.
During his ambassadorial work in Austria he chaired the IAEA Board of Governors. The role requires trust between states, legal clarity and diplomatic precision.
As state secretary at the Ministry of Foreign Affairs and later adviser to the president, he remained connected to central questions of the Slovenian state.
His presidency of the Constitutional Court completed the diplomatic path with an internal view of law, institutions and balance of powers.
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