Judge of the Constitutional Court (14 April 2009 - 12 October 2017)
President of the Constitutional Court (13 June 2016 - 12 October 2017)
Judge of the Constitutional Court (13 October 2017 - )
President of the Constitutional Court (13 October 2017 - 12 October 2021)
President of the Constitutional Court (13 October 2021 - )

Graduated from the Faculty of Law, Zagreb University in 1981. Passed the bar examination in 1983 and the notary public examination in 1994. Gained his LL D in civil law at the Faculty of Law Zagreb University in 2013. He defended a doctoral thesis on "Child welfare and the principle of the best interests of the child in the case-law of the European Court of Human Rights and the Constitutional Court of the Republic of Croatia."

After graduation he worked as a legal clerk in the Blato Winery in Zagreb (1981 - 1983), and at the same time he was trainee at the Zagreb Municipal Court and the then Zagreb Regional Court. Subsequently he was employed at the Prečko Military Construction Organization (1984 - 1986). He was judge at the Zagreb Municipal Court from 1986 to 1989. From 1989 he was employed at the Ministry of Justice as adviser in the Property Affairs Directorate, senior adviser, department head, head of the Directorate and deputy minister. He was Minister of Justice from 1995 to 1998. In that period he participated in writing and implementing regulations in civil law, the judicial system and the criminal law reform. He was director of the Croatian Intelligence Service and deputy president of the Office for National Security from 1998 to 2000. In January 2000 he enrolled in the Register of Attorneys of the Croatian Bar Association and in 2005 he was one of the founders of the Šeparović and Partners Law Firm seated in Zagreb. He was member of the Association of Defence Counsel Practising before the International Criminal Tribunal for the former Yugoslavia in The Hague and was for a time an attorney at this Tribunal. He was also member of the Council for the Civil Control of Security and Intelligence Agencies and external member of the Committee for the Judiciary of the Croatian Parliament. He is a regular member of the Croatian Academy of Legal Sciences.

He is the author and co-author of several books and articles in civil and public law: Purchase of Socially-Owned Flats and Denationalisation - Denationalisation of Building Land (Collection of Papers, Organizator, Zagreb, 1991); Expropriation Act (Ivica Crnić and Miroslav Šeparović, Informator, Zagreb, 1994); Aliens as the Holders of the Right to Own Property (Mladen Žuvela and Miroslav Šeparović, in Collection of Papers, Organizator, Zagreb, 1993 and Collection of Basic Regulations in Property Rights, Informator, Zagreb, 1995); Commentary on the Act on Compensation for Property Expropriated During the Yugoslav Communist Rule (Snježana Bagić, Mladen Žuvela and Miroslav Šeparović, Organizator, Zagreb, 1997); Property Rights Aspects of Legitimate Expectations (Hrvatska pravna revija, 2011); Children's Rights to Visit and Spend Time with his/her Parents (Hrvatska pravna revija, 2012); Ownership and other Proprietary Rights Act and Land Registers Act in the Case-law of the Constitutional Court of the Republic of Croatia (Snježana Bagić and Miroslav Šeparović, Inženjerski biro, 2017); Constitutional Guarantee of the Right to Property (Croatian Academy of Sciences and Arts, 2018); New Challenges before the Croatian Constitutional Court: The Constitutional Court as Guardian of the Fundamental Constitutional Values and Mediator of Social Phenomena (Croatian Academy of Sciences and Arts, 2021); Restriction on Religious Gatherings and Practicing Worship in Connection with the Ruling of the Constitutional Court Nos. U-II-5709/2020 and U-II-5788/20 of 23 February 2021 (Novi informator, 2021); and Conflicting Rights in Apartment Lease - How to Reach a Solution? (Snježana Bagić and Miroslav Šeparović, in Liber Amicorum Mladen Žuvela, Organizator 2022).  He is also author of a book entitled Child Welfare and the Principle of the Best Interests of the Child in Courts' Practice, the European Court of Human Rights and the Constitutional Court of the Republic of Croatia (Novi informator, 2014), for which he received the 2014 Dr Jadranko Crnić Foundation's acknowledgment as a work of particular significance for promoting the legal profession in the Republic of Croatia.

He has participated in many domestic and international conferences, seminars and symposiums.

He was awarded the Order of the Croatian Trefoil, Memorial Medal of the Homeland’s War, Memorial Medal of the Homeland’s Gratitude, Vukovar Memorial Medal and Order of Prince Branimir with ribbon.