Organizers Session I: Efficiency/Effectiveness Trade-offs Claudio Lucchese Università Ca’ Foscari, Veneziahttps://claudio-lucchese.github.ioFranco Maria NardiniISTI-CNR, Pisa, Italyhttp://hpc.isti.cnr.it/~nardini/ Session II: Neural Learning to Rank using TensorFlow Rama Kumar PasumarthiGoogle AIhttps://ai.google/research/people/105966Sebastian BruchGoogle AIhttps://ai.google/research/people/SebastianNimaBruchMichael BenderskyGoogle AIhttp://bendersky.github.io/Xuanhui WangGoogle AIhttps://ai.google/research/people/XuanhuiWang Session III: Unbiased Learning to Rank Harrie OosterhuisUniversity of Amsterdamhttps://staff.fnwi.uva.nl/h.r.oosterhuisMaarten de RijkeUniversity of Amsterdamhttps://staff.fnwi.uva.nl/m.derijke/Rolf JagermanUniversity of Amsterdamhttps://jagerman.nl/