Bill and Sara meet in an introductory graduate course. During the academic year, they fall in love and get married. At the beginning of the second year, they select different mentors in the same department and begin their dissertation research. The mentors and their groups frequently collaborate and coauthor publications. They both work extremely hard, but Sara frequently has Bill help her in the lab. On weekends they are commonly seen working together doing experiments that are exclusively part of Sara's research project. During the next three years Sara prepares six senior-authored manuscripts, and all are published in peer-reviewed journals. Bill is not included as an author on any of the papers, but he is acknowledged in five of them. In her last year in the program, Sara wins the prestigious graduate student honors day award and is offered a permanent position in a biotechnology company. Bill is not likely to be finished with his dissertation research anytime soon and has not published his work, not even the abstracts. You are the department chair and students come to you to complain that Sara and her mentor are acting inappropriately. What do you do?