Purpose: The purpose of this study was to identify the skills, knowledge, and experiences differentiating expert and competent strength and conditioning (S&C) coaches. Method: The participants were 87 elite-level head S&C coaches with an average of over 18 years of coaching experience. These coaches were employed by teams from the MLB, NBA, NFL, NHL, NCAA Division 1 FBS "Power Five" Conferences, United States National Teams, and the Australian Football League. This study used both a qualitative and quantitative research design through the use of the Delphi method, which incorporated three rounds of surveys. The first-round survey asked the participants to identify at least one important skill, knowledge area, and experience that should be possessed by an expert and competent S&C coach respectively. The characteristics generated from the first round were placed on a second-round survey and rated on their level of importance using a five-point Likert scale. If a characteristic received a suggestion for rephrasing, and did not reach a level of consensus, or an entirely new characteristic was suggested, then it was placed on the final-round survey to be rated again. Characteristics that reached a level of consensus were placed on the final list of characteristics. Results: A total of 46 characteristics reached a level of consensus and were placed on the final list of characteristics. Conclusion: There now exists an empirically validated list of characteristics differentiating expert and competent S&C coaches. This list can aid in the selection, evaluation, and development of S&C coaches.