A Brief Ex Libris Chronology (1978-2005) (revised 5-Apr-2017)
[Note: The numbered references below are links to the References section of the https://en.wikipedia.org/wiki/Ex_Libris_Group webpage.]
1978 Hebrew University of Jerusalem initiates a project, with Yohanan Spruch as its development head, to create a library management system to handle both Hebrew and Latin character sets, as required by the University. The software is called ALEPH (Automated Library Expandable Program [Hebrew University]). (Aleph is also the first letter of many Semitic alphabets).  A central system on one central (mainframe) computer (CDC).
1982 First customer outside Hebrew University: CSIC (the Spanish national research council)
Ca. 1983 Aleph 200 (Aleph version 2) – a decentralized system on a VAX-11/730 mini-computer with VMS operating system and ISAM database
1983 Yissum (the technology transfer company of the Hebrew University) founds Aleph-Yissum Ltd., a new company to commercialize the software. Yohanan Spruch, the original developer of Aleph, becomes the company's chief technology officer 
1983–1988 All of the eight universities in Israel buy the Aleph program and link up in a network 
Ca. 1985 First Aleph 200 customer outside of Israel: Jewish Theological Seminary in NYC.
1986 Ex Libris Ltd. founded by technology entrepreneur Azriel Morag to market the software overseas.
Ca. 1986/7 First office in Europe – in Luxemburg.
1989 ALEPH selected by the Danish Technical University Library, and by CERN (Geneva, Switzerland). Aleph300 developed in partnership with DTU.
1990/1 Aleph 300, an advanced version of Aleph 200, released: VMS and Unix operating system, and First GUI (on VT Terminals, block mode). Developed and marketed for the European market. Photo of Vax-11 730 .
1993 Aleph deployed by the seventeen libraries of the Vatican 
1993 CASLIN (Czech and Slovak Library Information Network), led by Czech and Slovak national libraries, selects ALEPH. First major consortium outside of Israel to do so.
(by) 1995 200 libraries in 27 countries have bought Aleph 
1995 Aleph-Yissum merged with Ex Libris Ltd. and reorganized as the Ex Libris Group, headed by Azriel Morag as the group's chief executive officer.
1997 Aleph 500 released - An innovative and new system (multi-tier client/server) using Unix and Oracle. Developed and marketed for All markets (including American market).
1997 Ex Libris acquires Dabis, a leading vendor of automated library systems in the German speaking countries.
July 2000 Ex Libris launches MetaLib, a federated search system that conducts simultaneous searches in multiple information resources such as library catalogs, journal articles, newspapers.
2004 Ex Libris launches Verde, an electronic resource management system that manages the acquisition and licensing of electronic resources.
Francisco Partners became the sole owner of Ex Libris, buying out various owners, in 2006.
2006 Ex Libris acquires Endeavor Information systems from Elsevier (http://bit.ly/2hDDdIJ)
Leeds Equity acquires Ex Libris in 2008. http://bit.ly/1jcEd6C
Golden Gate Capital bought Ex Libris in 2012. In December 2015, Ex Libris was acquired by ProQuest . as a result, "Ex Libris, a ProQuest Company", also managed the products of the Workflow Solutions division of ProQuest, such as Intota, Summon, and 360 Link.
3 Times Higher Education 1995 article on Aleph: https://www.timeshighereducation.com/features/instant-access-distant-library/98933.article