Dr. Meziani was involved in the studies of the neutron spin structure at SLAC using a polarized 3He target in the early 90s and brought some of these experimental studies from SLAC to Jefferson Lab where his research flourished into some of the important science motivations of the 12 GeV upgrade of Jefferson Lab.

Dr. Meziani is spokesperson of many experiments at Jefferson Lab and was also a member of the Program Advisory Committee (2004-2007). He has servedas theChair of Jefferson Lab Users Group Board of Directors (2009-2011). In 2007 he co-chaired, the QCD and Hadron Physics Town Meeting of the APS/Division of Nuclear Physics (DNP). He was a member of the Nuclear Science Advisory Committee (NSAC) Long-range Plan Working Group in 2007 and 2014. In 2012 he was a member of the Subcommittee on Scientific Facilities of NSAC, and more recently (2017-2018), he served on the committee on a U.S.-Based Electron Ion Collider Science Assessment at the National Academy of Sciences.