To receive a Doctor of Philosophy Degree (PhD) at Northern Arizona University, you must complete a planned group of courses, from one or more disciplines, ranging from at least 60 - 109 units of graduate-level courses. Most plans require research, a dissertation, and comprehensive exams. All plans have residency requirements regarding time spent on the Flagstaff campus engaged in full-time study.
The full policy can be viewed here.
In addition to University Requirements:
| Minimum Units for Completion | 60 |
| Additional Admission Requirements | Required |
| Dissertation | Dissertation is required. |
| Comprehensive Exam | Comprehensive Exam is required. |
| Oral Defense | Oral Defense is required. |
| Research | Individualized research is required. |
| Emphasis Required | An emphasis is required for this degree. |
Purpose Statement
The Interdisciplinary PhD Program in Earth Sciences & Environmental Sustainability (ESES) brings together students and faculty from across the University. Many ESES topics address questions that can inform decisions and solutions related to environmental issues made by governments, business and society.
ESES students produce discipline-specific science and engineering of the highest quality. They strive to integrate different disciplines from the natural sciences, social sciences and engineering to build, connect and communicate knowledge to increase the broader impacts of their research.
ESES students study how planet Earth is changing due to natural phenomena and human activities over spatial and temporal scales. They observe, explain, understand, and project trends in earth, environmental, and societal systems, and investigate the drivers and processes that shape natural and social worlds and the interactions between them.
Earth Systems Emphasis
This emphasis area will train and educate leaders in rapidly growing industries and academic fields such as natural resources and energy, and in government agencies that require PhD-level researchers to inform policy decisions on some of the greatest problems facing society.
Climate and Environmental Change Emphasis
This emphasis often combines the long-term perspective from geological archives with process-oriented investigations of today, with the goal of integrating a field-based understanding of natural systems into predictive models to support sustainable resource management in the face of climate change.
Engineering Sustainable Systems Emphasis
This emphasis is designed for engineers who are interested in understanding the economic, societal and environmental implications of engineering systems. It provides a strong background in engineering enhanced by understanding future sustainability of our environment, and will prepare you for careers in academia, industry, and governmental organizations.
Ecology, Evolution and Conservation Biology Emphasis
This emphasis will train and educate leaders in areas of research and application at the cutting edge of conservation and sustainability professions, including basic research, management decision-making, sustainable policy development, and applied conservation.
Environment and Society Emphasis
This emphasis will prepare leaders in the areas of natural resources management, community engagement, the non-profit/NGO sector, academia, and in government agencies that require PhD-level researchers to inform management and policy decisions that address some of the greatest environmental problems facing society today.
Student Learning Outcomes
ESES students will select one of the following three emphasis areas, based upon their background and the work they will complete toward their dissertation:
Earth Systems Emphasis
The NAU graduate online application is required for all programs. Admission to many graduate programs is on a competitive basis, and programs may have higher standards than those established by the Office of Graduate and Professional Studies.
Admission requirements include the following:
Visit the NAU Graduate Admissions website for additional information about graduate school application deadlines, eligibility for study, and admissions policies.
Ready to apply? Begin your application now.
International applicants have additional admission requirements. Please see the International Graduate Admissions Policy.
Individual program admission requirements over and above admission to NAU are required.
This Doctoral degree requires 60 units distributed as follows:
Take the following 60 units, with a minimum GPA of 3.0:
Common Courses (7 units)
Graduate Seminar (2 units)
Professional Experience (6 units)
Research Methods Courses (3 units)
Climate And Environmental Change Emphasis (27 units)
Earth Systems Emphasis (27 units)
Ecology, Evolution & Conservation Biology Emphasis (27 units)
Engineering Sustainable Systems Emphasis (27 units)
Environment and Society Emphasis (27 units)
You may have no more than 6 units of 400-level courses. These 400-level courses cannot have been used to satisfy the requirements for any previous degree program(s). You must get your dissertation committee's approval for any courses taken outside of NAU.
Dissertation (15 units)
Research Requirements
In addition to completing 45 units of coursework, you must demonstrate your independence, research skill, and experience in a discipline within earth sciences and environmental sustainability by choosing a problem and research area in consultation with your dissertation committee and then satisfactorily completing a dissertation.
Your dissertation research meets our standards when it is soundly based in the theoretical context of the subject, proceeds with a sound design that gives due attention to statistical adequacy, and concludes with findings and inferences set forth within an appropriate theoretical context. Your dissertation must demonstrate that you have mastered your field of specialization, carried out independent scholarly work, and contributed significant new knowledge. You must pass an oral defense of your dissertation.
Comprehensive Exam
We also require that you demonstrate written and oral communication skills in English at a level that will allow you to effectively communicate your ideas and knowledge to a wide range of audiences. Part of this demonstration involves comprehensive oral exams by the end of your 4th semester designed to establish your competence in a breadth and depth of subjects within your emphasis area and the larger field of earth sciences and environmental sustainability.
Research Competency Requirement
NAU policy for PhD programs includes a research competency requirement that must be satisfied before a student can be admitted to candidacy. This interdisciplinary doctoral program recognizes ENV 555, EES 605, and EES 606, plus one graduate level course with significant content in statistics and/or science/engineering research methods, as meeting this requirement.
Be aware that some courses may have prerequisites that you must also successfully complete. For prerequisite information, click on the course or see your advisor.