Question: Who was the seventh president of the oldest higher education institution in suburban Long Island?

<P0-S0> Higher education in Portugal is divided into two main subsystems: university and polytechnic education. <P0-S1>  It is provided in autonomous public universities, private universities, public or private university institutes, polytechnic institutions and higher education institutions of other types. <P0-S2>  Higher education in state-run educational establishments is provided on a competitive basis, a system of "numerus clausus" is enforced through a national database on student admissions. <P0-S3>  In addition, every higher education institution offers also a number of additional vacant places through other extraordinary admission processes for sportsmen, mature applicants (over 23 years old), international students, foreign students from the Lusosphere, degree owners from other institutions, students from other institutions (academic transfer), former students (readmission), and course change, which are subject to specific standards and regulations set by each institution or course department. <P0-S4>  Portuguese universities have existed since 1290. <P0-S5>  The oldest such institution, the University of Coimbra, was first established in Lisbon before moving to Coimbra. <P0-S6>  Historically, within the scope of the now defunct Portuguese Empire, the Portuguese founded in 1792 the oldest engineering school of Latin America (the Real Academia de Artilharia, Fortificação e Desenho), as well as the oldest medical college of Asia (the Escola Médico-Cirúrgica de Goa) in 1842. <SEP> <P1-S0> The Faculty of Economics at the University of Kragujevac is an educational and scientific institution in the city of Kragujevac. <P1-S1>  It was established as a department of the University of Belgrade Faculty of Economics on 1 October 1960, and became an independent higher education institution on 16 December 1975. <P1-S2>  Since its establishment the Faculty has strived at creating an important position in the country and the region by educating economists, managers, and also through encouraging scientific work of its staff who conducted their research projects in the field of fundamental and applied research. <P1-S3>  With this aim, curricula have been improved in order for them to be aligned to the latest scientific and educational trends of the contemporary world. <P1-S4>  In 2009, The Faculty of Economics fulfilled all the requirements of the new Serbian Law on Education and became a fully accredited higher education institution. <P1-S5>  All three levels of study are accredited: undergraduate, graduate and PhD. <SEP> <P2-S0> Adelphi University is a private, nonsectarian university located in Garden City, in Nassau County, New York, United States. <P2-S1>  Adelphi also has centers in Manhattan, Hudson Valley, and Suffolk County. <P2-S2>  For the tenth year, Adelphi University has been named a "Best Buy" in higher education by the "Fiske Guide to Colleges". <P2-S3>  The university was also named a 2010 Best College in the Northeastern Region by "The Princeton Review". <P2-S4>  It is the oldest institution of higher education in suburban Long Island. <P2-S5>  The institution was awarded the 2010 Carnegie Classification for Community Engagement by the Carnegie Foundation for the Advancement of Teaching. " <P2-S6> U.S. News & World Report" ranked Adelphi University #146 among national universities. <SEP> <P3-S0>  He served as the seventh president of Adelphi University from 1985 until his dismissal in 1997 due to the school's financial problems. <P3-S1> Peter Theodore Diamandopoulos (September 1, 1928 – April 1, 2015) was a Greek–American academic administrator.