He studied in Donetsk higher military-political school of engineering troops and troops of connection (1989–1991), graduated from the historical faculty of Kam’yanets'-Podil'skuy Teacher Training University named by V.P.Zatonsky (1995), post-graduated from the M.S.Hrushevsky Institute of Ukrainian archaeography and fontology of National Academy of Sciences of Ukraine (1998), and studied for the degree of doctor at National Taras Shevchenko University of Kyiv (2008).

– History of Ukraine (National Taras Shevchenko University of Kyiv, 2000): Financial police of Government Ukrainian State headed by Hetman P.Skoropads’ky (29 April – 14 December 1918) [1].

Dissertation for a doctoral degree in speciality 07.00.01 – History of Ukraine (National Taras Shevchenko University of Kyiv, 2008): Financial police headed by Central Rade and Governments of Ukrainian People's Republic (March 1917 – April 1918) [2].

: Гай-Нижник П. Документальні джерела і матеріали до історії фінансової політики уряду Української Держави (29 квітня - 14 грудня 1918 р.).

- 47 с./ A new monography of Pavlo Hai-Nyzhnyk "Documentary sources and materials to the history of a financial policy of the Ukrainian State government (29 April - 14 December 1918)" was published.

: Гай-Нижник П. Фінансова політика уряду Української Держави Гетьмана Павла Скоропадського (29 квітня - 14 грудня 1918 р.).

- 303 с./ A new monography of Pavlo Hai-Nyzhnyk "The fiscal police headed by Central Rade, governments UNR, Ukrainian State, USRR (1917–1930)" was published.

- 304 с./ In the new book the author clarifies the process of the higher and local state authorities formation in Ukraine in the days of the Ukrainian National Republic (in the times of the Central Rada and Directory) and the West Ukrainian People's Republic (WUPR) in the context of complex process of national state formation in the turbulent 1917 – 1920 years.

The monograph is intended for historians, men of law, government employees, political scientists and anybody who is interested in the Ukrainian past at the beginning of the 20th century.

: Гай-Нижник П. Українська дипломатія й міжнародна фінансова політика урядів Центральної Ради, Української Держави (Гетьманату) та Директорії УНР (1917–1922 рр.).

): від політики шантажу і примусу до війни на поглинання та спроби знищення.

Considered theoretical political, geopolitical, cultural, historical and foreign policy aspects of the annexation of the Crimea and armed conflict in the Donbass.

With realism and withpositions interpreted specifics of international relations in the post-imperial (post) political space, including the place and role of Ukraine utsyvilizatsiynomu opposition Moskovian European West and East.

: Науково-документальна збірка до 90-річчя запровадження державної служби в Україні / Верстюк В., Гай-Нижник П., Коник С. та ін.

The authors begin their study with the analysis of the ancient society state organization and complete with the characteristic of construction and development of government service in the independent Ukraine.

The text of "Essays" is prepared as part of a research project, which is carried out to-order the Centre for adaption the government service to the standards of the European Union, by means the State Budget of Ukraine.

The authors of the report are well - known scientists and experts in the field of banks and the finance, jurisprudence, history, sociology, economic security and the government administration.

The authors of the report are well - known scientists and experts in the field of banks and the finance, jurisprudence, history, sociology, economic security and the government administration.

: Держава, влада та громадянське суспільство у документах політичних партій України (кінець 1980-х - перша половина 2011 рр.)

- 808 с./ The collection presents extracts from the documents of modern Ukrainian political parties, in which their view for functioning of government, state institutions and civil society in Ukraine are displayed.

– 588 с./ The reference book includes information materials about modern Ukrainian political parties (both active and those that ceased their existence) and their first leaders (founders), electoral coalitions, created on the eve of elections to the Verkhovna Rada of Ukraine III-VI convocations.

– 504 с./ In the collective labor sponsored summarizes the role, objectives, principles and achievements during the restoration of Ukrainian state independence Ukraine, analyzes the general trends and peculiarities of its development at the present historical stage, deepening the conceptual and theoretical-methodological basis, it appears the role of basic concepts and categories in Ukrainian development.

: Гай-Нижник П. П., Батрак О. П. Догматика віри в Кафолічній Церкві й запровадження християнства у Давній Русі (кінець ІХ – середина ХІ ст.).

Authors, given the historical-hermeneutic interpretation and Slavic Cyril and Methodius tradition (in comparison with Arian, Byzantine and Latin), the then untie knots theological ideas and dogmas, including such terms and concepts as the "Holy Trinity", "consubstantial "" podibnosuschnist "" Creed "and so on.

Establish religious and political uzrinnya, tactics and strategy of consolidation of the Faith of Christ Grand Duke of Kyiv Yaroslav (the Wise) Vladimirovich, his vision of the Church in the Ruthenian state, society, in the Slavic world view, as well as among religious and spiritual centers of the state of contemporary Christian world.

: Російська окупація і деокупація України: історія, сучасні загрози та виклики сьогодення: Матеріали Всеукраїнської науково-практичної конференції (Київ, 2016 р.)

/ The proposed collection contains Ukrainian scientific-practical conference "The Russian occupation and the de-occupation of Ukraine: history, current threats and challenges", held in 2016 in Kyiv.

The authors of the papers presented its own view on the historical origins and parallel Russian aggression against Ukraine, gave a scientific assessment of the Russian Federation as a state-aggressor and sponsor of international terrorism, analyzed the Russian-Ukrainian war that began in 2014 as a result of the treacherous attack Russia and Challenges and how to strengthen the system of national security of Ukraine.

: Агресія Російської Федерації проти України: проблеми оптимізації державного управління та системи національної безпеки.

– 28 с./ The purpose of expert-analytical report is to analyze the characteristics of armed political conflict in eastern Ukraine and the development of possible scenarios to solve it and reintegration of the occupied territories of Donbass and Crimea Ukrainian constitutional and socio-cultural space.