The **Mathematical Society of South-Eastern Europe** (MASSEE) was established on 1 March 2003. However, the Society might be considered as a continuation of the Balkan Mathematical Union founded in 1937 and re-founded in 1966. Details of this earlier Union are given below.

The registered office of MASSEE is hosted by the Hellenic Mathematical Society in Athens, Greece. The main aim of the Mathematical Society of South-Eastern Europe is to develop cooperation between and beyond the communities that are involved and further collaborate for adding value to the common activities organized in the area with main purpose the advancement of mathematics research and education. The mathematical Societies that are members of the Mathematical Society of South Eastern Europe are: the Cyprus Mathematical Society; the Hellenic Mathematical Society; the Romanian Mathematical Society; the Bulgarian Mathematical Union; the Serbian Mathematical Society; the Macedonian Mathematical Society; the Turkish Mathematical Society; and the Albanian Mathematical Association.

Less than six months after the Mathematical Society of South-Eastern Europe was founded, their first Congress was held in Borovetz, Bulgaria, 15-21 September 2003. The following few paragraphs are a slightly modified version of an article found on [1].

The idea to have a mathematical society comprising mathematicians from Balkan countries goes back to the early decades of the last century. In September 1934 the first Inter-Balkan Mathematical Congress took place in Athens. It was decided to start a new journal focused on the region. The first Balkan mathematical journal *Revue Mathematique de l'Union Interbalkanique* appeared in 1936 and in 1938. The second Inter-Balkan Mathematical Congress took place in September 1937 in Bucharest. During that Congress the Inter-Balkan Union of Mathematicians was founded. The Second World War began two years after the Union was founded and it was followed by years of the Cold War. These events made the collaboration between the Balkan countries extremely difficult and Union essentially ceased to exist during this period. The first contacts and discussions aimed at reviving the Union started in 1956.

In September 1966, during the third Congress of Balkan Mathematicians (held again in Bucharest), the statutes of the Balkan Mathematical Union (BMU) was adopted and the activities revived. The 70's were the golden era for the Balkan Mathematical Union: the Fourth Congress (Istanbul 1971), the Fifth Congress (Belgrade 1974), several conferences and symposiums, Balkaniads for university students and for young researchers, scientific sessions during the meetings of the Executive Council of Balkan Mathematical Union, etc. The publication of a new journal named "Mathematica Balkanica" was started. It was published by the Union of Mathematicians, Physicists and Astronomers of Yugoslavia and edited by Academician Djuro Kurepa (Volume 1 appeared in 1971 with Volume 6 published in 1980). In accordance with the decision of the Executive Council of the Balkan Mathematical Union (taken in July 1984) in 1987, the National Committee for Mathematics of Bulgaria and the Bulgarian Academy of Sciences started the publication of *Mathematica Balkanica - New Series*, edited by Academician Blagovest Sendov. Since then the journal was regularly published and 28 volumes appeared till 2014.

After a period of inactivity for the Balkan Mathematical Union, lasting more than a decade, and responding to a profound desire of the Balkan mathematicians, the Mathematical Societies of the Balkan countries decided to revive the activities of the Balkan Mathematical Union and to establish a new organization: the Mathematical Society of South-Eastern Europe (MASSEE). MASSEE is aimed at the continuation of the activities and the traditions of the Balkan Mathematical Union.

At the MASSEE Congress it was decided to continue the publication of *Mathematica Balkanica - New Series* under the auspices of MASSEE. Due to Academician Sendov's new engagements, he retired from the position of Editor-in-Chief, but still contributes as the Honorary Editor-in-Chief of the journal. Academician Kenderov was appointed by the Executive Council of MASSEE the new Editor-in-Chief of *Mathematica Balkanica*. A new Editorial Board was constituted consisting of members of the Scientific Committee of the MASSEE Congress.

Let us look at some recent congresses organised by MASSEE with other societies or university departments.

**The Fifth MASSEE International Congress on Mathematics 2015**

This Congress was held in the President Hotel, Athens, Greece, 22-26 September 2015. It was organised by the Mathematical Society of South-Eastern Europe (MASSEE) and the Hellenic Mathematical Society, in cooperation with The Department of Mathematics of the University of Athens, the School of Applied Mathematics and Physical Sciences of the National Technical University of Athens and the Aristotle University of Thessaloniki. The Congress had English as its official language and consisted of several workshops, symposiums, and sessions covering multiple themes.

**MASSEE Meeting and SEEMOUS Event 2016**

This was held in Protaras, Cyprus 1-6 March 2016 organised by the Mathematical Society of South-Eastern Europe and the Cyprus Mathematical Society. During the MASSEE Meeting the SEEMOUS 2016 Mathematical Olympiad for University Students took place. SEEMOUS is the South-Eastern European Mathematical Olympiad for University Students.

**European Student Conference in Mathematics - EUROMATH 2016**

This took place in the City of Thessaloniki, Greece, between the 30 March 2016 and 3 April 2016. It was organised by the Cyprus Mathematical Society and the Thales Foundation, in cooperation with the Le-MATH Project Focus Group, the Hellenic Mathematical Society and the Mathematical Society of the South-Eastern Europe. It was open to students of age 9-18 from any European or International School who with or without a presentation. The Conference consisted of several workshops and sessions covering multiple themes. Students were encouraged to present work or projects in mathematics. The official language of the conference was English.

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