Collaborative Communication (CC), also known as Nonviolent Communication, is an integrated system of concepts and skills that fosters high quality relationships, a positive environment and effective communication. This research evaluated whether training a group of executives in CC improved the quality of relationships and communications among team members and between teams, the efficiency and effectiveness of those receiving training, and the effectiveness of teams which include executives who received training. A comprehensive six-month training program in CC was offered to 23 executives. Quantitative data measuring the executives’ perceptions of the work environment, the quality of interpersonal interactions and communication effectiveness were collected before training, midway through the training and after training. Semi-structured interviews were conducted with the executives seven months after the training was completed to gain qualitative information about the nature of the long-term benefits of the training that the executives observed. Results showed statistically significant changes on 31 of the 33 quantitative measures. Executives reported that conversations and meetings were notably more efficient and estimates of the impact of this greater efficiency indicated a probable payback period to the organization of 2-10 months for all expenses. Qualitative results showed executives valued the impact of CC training on their ability to communicate clearly, make requests that solve problems, understand where others are coming from, speak openly and directly, mediate conflicts among team members and facilitate effective meetings. Trust, engagement and other work-culture factors were reported as improved.