The topical workshop "Nine Billion Years of Neutral Gas Evolution" is a three-day meeting to be held July 29-31, 2019 at ESO headquarters. The "nine billion years" to which the title refers represent the fraction of cosmic time over which forthcoming surveys with SKA precursors will probe HI in galaxies (i.e., to a maximum redshift z ~ 1.45). The workshop aims to forge connections across wavelengths, among different ISM and IGM phases, and between observation and theory, and is embedded in the four-week MIAPP programme "Galaxy Evolution in a New Era of HI Surveys." Registration for the workshop is independent of participation in the programme, although programme participants are invited to register and participate. Confirmed speakers include Sanchayeeta Borthakur, Dušan Kereš, Claudia Lagos, Marcel Neeleman, Mary Putman, and Linda Tacconi.
Workshop participants will be expected to pay -- in cash on the morning of July 29 -- a modest workshop fee, and (optionally) the cost of a conference dinner. A receipt stating that money was received to cover expenses related to the topical workshop will be issued, but the organizers are not allowed to issue invoices.