Researchers of graduate student success have recently begun engaging in studies aimed at establishing a better understanding of what practices best assist in graduate student retention and degree completion. Simultaneously, Writing Center scholars have been making a concerted effort to undertake empirical research focused on the everyday work of the Center. This dissertation uses a mixed-methods study design to uncover intersections and disconnects between what graduate student writers report they do, what graduate student writers actually do, what advisors believe graduate student writers do, and how writing centers can develop practices and programs that best fit the multidimensional experiences of graduate student writers. Graduate writers are currently underrepresented in Writing Center and Writing Studies scholarship. This dissertation provides a glimpse into the working lives and lived experiences of graduate writers through the use of national surveys of graduate writers, graduate advisors, and writing center practitioners and through in-depth observations and individual interviews. Collected data show that graduate students and graduate advisors believe writing center spaces are designed primarily to assist undergraduate students, a belief that is supported by actual practices of writing center practitioners. This research will be beneficial for writing scholars and practitioners wishing to continue to offer innovative, intentional, research-based support for writers across the spectrum. This study will expand current understandings of the actual and perceived experiences of graduate writers, knowledge that will be foundational to future practices and research that can aid in the continual growth and development of Writing Center and Writing Studies theory and practice. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]