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2015
January – Peter Walton and Brian Hall create Development Group

2016
April – Alex Prus joins as Manager of Development Group

2017
January – Rick Eddy, Sandra Serafini, Alan Black, Erich Simmons join Alex Prus to create Development Group Committee

2018
January – Michael Kennedy, Mark Kadlecik join Development Group as Referee Coaches
January – James Conlee joins Development Group as Assistant Referee Coach
January – “Training Tier” Created
January – John Westbrooks joins Development Group as Sports Scientist
February – Sports Science Program Revolutionized
July – Senior Roster promotes first Development Group Referee
September – USL Restructures to USL Championship, USL League One

2019
January – Amy Edwards joins Development Group as Video Analyst
January – Senior Roster promotes first Development Group Assistant Referees
March – Senior Roster promotes two more Development Group Referees
2019 [throughout the season] – Senior Roster promotes five more Development Group Referees

2020
January – Howard Webb Rebrands Development Group as “PRO2”
January – Senior Roster promotes three more Development Group Referees