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My current research activities focus mainly on jet physics. With G.P. Salam and M. Cacciari, we have introduced three tools widely used at the LHC: the antik t algorithm, FastJet (a package for jet finding), and a strategy for pileup subtraction. A fraction of my research today is focused on an analytic understanding of jet substructure and related topics.
More generally, I am interested by LHC phenomenology and QCD in particular. For example, I also study the highenergy limit of QCD with the group at the IPhT in CEA Saclay, an activity that I started when I was a PostDoc at the IPhT and pursued at the Brookhaven National Laboratory.
My earlier research experience, during my PhD, focused on the proton structure functions and the interplay between perturbative QCD and Regge theory. I have also worked independently on the structure of the QCD vacuum, using lightcone quantisation.
10/2018  now:  CNRS Senior Scientist at the IPhT (CEA Saclay) 
02/2010  09/2018:  CNRS Associate Scientist at the IPhT (CEA Saclay) 
10/2009  09/2010:  CERN fellow 
10/2007  09/2009:  Research Associate at the Brookhaven National Laboratory 
10/2004  09/2007:  Postdoc as a FNRS Research Fellow (Charg\'e de recherches) With this fellowship, I have visited the following places:

The 3 works that lay basis for the current jetreconstruction framework at the LHC:
The original work addressing the question of infraredandcollinear safety for jet clustering:
Recent work on jet substructure with perturbativeQCD analytic control:
Recent work on pileup mitigation (areamedian extensions and proposal for new methods):
Two representative examples of work done on the highenergy limit of QCD:
12/2016:  Thibaud Prize of the ``Académie des Sciences, Belles Lettres et Arts'' in Lyon (awarded every 2 years in nuclear and particle physics) 
10/201603/2020:  member of the ANR DenseQCDAtLHC (Projet Blanc; PI: E.Iancu) 
10/201509/2019:  PI of the ANR OptimalJets (Défi de tous les savoirs) 
10/201103/2016:  member of the ANR CGC@LHC (Projet Blanc; PI: F.Gélis) 
10/201009/2014:  PI of the ANR Jets4LHC (Chaire d'Excellence) 
07/1997:  Roset Prize of the AMULg (Association of the Ulg Mathematicians), granted each year to a student in Mathematics 
07/1996:  Participation, with the Belgian team, to the 37th International Mathematical Olympiad. Bronze medal 
20182019:  Supervision of Vincent Theeuwes' postdoc (German DAADPrime) 
20172020:  PhD advisor of Giovanni Stagnitto (with M. Cacciari) 
20172020:  PhD advisor of Paul Caucal (with E. Iancu) 
20172019:  Supervision of Davide Napoletano's postdoc (ANR OptimalJets) 
2017:  Master (2nd year) internship of Paul Caucal (with E. Iancu) 
2017:  Master (1st year) internship of Linnéa Gräns Samuelsson (with E. Iancu) 
20142017:  PhD advisor of Lais Sarem Schunk (graduated on September 21 2017) 
2014:  Master internship advisor of Lais Sarem Schunk 
20112013:  Supervision of JiHun Kim's postdoc (ANR Jets4LHC) 
2011:  Master internship advisor of Stéphane Dartois (ENS Lyon) 
04/2017:  External examiner for Heather McAslan (PhD) 
2011now:  Exercises for the QCD lectures at the ENS (Master 2) (6 hours) 
06/2016:  Lectures on jet physics at the QCDMasterClass summer school (France, 6 hours) 
06/2016:  Member of Matthias Saimpert's PhD jury 
12/2015:  Lectures on Advanced QCD at the UCL (Louvain, Belgium, 10 hours) 
10/2015:  Lectures on jets physics the Prague University (6 hours) 
2015:  QCD lectures at the ENS (Master 2) (12 hours) 
10/2014:  Member of Martin Zeeman's PhD jury 
09/2014:  Lectures on jets physics at a Summer school in Natal (Brazil, 6 hours) 
04/2014:  Lectures on QCD and jet physics at a school in Trento (Italy, 6 hours) 
09/2011:  Discussion Leader at the CERN European School of HighEnergy Physics (Romania, 2011, 11 hours) 
09/2010:  Lectures on Phenomenology of hardonic collisions at the BND Summer School (Oostende, Belgium, 6 hours) 
12/2008:  Lectures on Advanced QCD at the UCL (Louvain, Belgium, 10 hours) 
2004:  Physics laboratories for 1^{st} year students in Computer Sciences (50 hours/year) 
2003:  Physics laboratories for 1^{st} year students in Computer Sciences (50 hours/year) 
20002001:  Programming exercises for B.A. students in Chemistry (30 hours/year) 
2018now:  Member of the IPhT Scientific Council (``Conseil Scientifique'') 
2016now:  Member of the IT Committee (``Commission Informatique'') of the IPhT 
2016now:  Coordinator of the jet working group of the GDRQCD 
09/201209/2016:  Member of the Section 02 (``Particle physics: Theory and Models'') of the French National Committee for Scientific Research (CoNRS) 
2011, 2013:  Jet contact for the LesHouches Physics at TeV collider workshops 
2018:  Main organiser (with Matteo Cacciari and Reina Camacho) of the Boost 2018 conferenc 
2016:  Main organiser (with Matteo Cacciari) of the PSR 2016 workshop 
2015:  Organisation committee for the conference ``Poetic 6'' 
2015:  Organisation committee for the conference ``Blois 2015'' 
04/2014:  Coorganisation of the workshop ``QCD and forward physics at the LHC'' 
07/2013:  Coorganisation of the ``Workshop on jets in HeavyIon collisions'', in Paris 
10/2011now:  Coorganisation of the weekly Particle Physics and Cosmology seminars at the IPhT (CEA Saclay) 
10/200809/2009:  Organisation of the weekly Nuclear Theory Group seminars at Brookhaven National Laboratory 