Intermediary actors have been recognized for their role in facilitating collaborations to achieve sustainability goals. Yet how voluntary sustainability collaborations, guided by intermediary actors, unfold in practice remains underdeveloped. Building on empirical data from the Principles for Responsible Management Education (PRME) network and using a network brokerage lens, we unfold dynamics of voluntary sustainability collaboration in the presence of an intermediary actor. We find that intermediaries act as sustained iungens brokers in voluntary sustainability collaborations, by connecting other actors and coordinating new collaborations in a multi-level network. Their activities are affected by tensions inherent to iungens brokerage in a voluntary setting, and factors influencing the success of the network collaborations. We contribute to the sustainability literature by offering a firsthand view on the dynamics of sustainability collaborations through an autoethnographic approach. We provide implications for sustainability collaborations in voluntary settings and recommendations for advancing responsible management education through collaboration.

中介行为者在促进合作以实现可持续发展目标方面的作用已得到认可。然而，在中介行为者的指导下，自愿的可持续发展合作如何在实践中展开，仍然不发达。基于来自负责任管理教育原则 (PRME) 网络的经验数据，并使用网络经纪镜头，我们在中介参与者存在的情况下展开了自愿可持续性合作的动态。我们发现，中介机构通过连接其他参与者并协调多层次网络中的新合作，在自愿可持续发展合作中充当持续的 iungens 经纪人。他们的活动受到自愿环境中 iungens 经纪所固有的紧张局势以及影响网络合作成功的因素的影响。我们通过自我民族志方法提供有关可持续发展合作动态的第一手资料，从而为可持续发展文献做出贡献。我们为自愿环境中的可持续发展合作提供了启示，并为通过合作推进负责任的管理教育提出了建议。