Princeton CBE Graduate Program Guide 2026

Princeton CBE Graduate Program Overview

Princeton University’s Department of Chemical and Biological Engineering (CBE) offers one of the most prestigious and intellectually stimulating graduate programs in the field, combining rigorous technical training with an intimate, mentorship-driven educational model. The department deliberately maintains a medium-sized graduate program to foster close working relationships between advisors and students and cultivate genuine camaraderie among the student body — a philosophy that distinguishes Princeton from larger, more impersonal programs.

The program offers four distinct graduate pathways: the PhD in Chemical Engineering, the PhD in Chemical Engineering and Materials Science (a joint degree with the Princeton Materials Institute), the Master of Science in Engineering (MSE) with thesis, and the Master of Engineering (MEng) coursework-only degree. Each pathway is carefully designed to serve different career objectives, from independent research leadership to professional skill enhancement.

At the heart of the Princeton CBE experience is original research. The PhD program centers on a doctoral dissertation that represents a genuine contribution to knowledge, supported by a structured progression through core coursework, the distinctive First Proposition qualifying examination, teaching experience, and professional development. For students exploring similar engineering programs, our guides to Princeton MAE graduate programs and Princeton CBE undergraduate programs provide complementary perspectives on the university’s engineering ecosystem.

PhD Program Structure and Requirements

The Princeton CBE PhD is a five-year program designed to transform talented students into independent researchers capable of leading innovation in industry or academia. The program’s structure balances coursework mastery, research creativity, teaching skills, and professional communication into a comprehensive educational experience.

PhD candidates must complete ten courses in total: five core courses that establish the fundamental knowledge base, one engineering ethics course (EGR 501), three technical electives at the 400-level or above in engineering or natural sciences, and one unrestricted elective that can be from any field — students sometimes choose foreign languages, policy courses, or molecular biology to broaden their perspectives.

Beyond coursework, the PhD journey includes several critical milestones. The First Proposition general examination in the second year tests research creativity and subject mastery through both written and oral components. All PhD students must serve at least one semester as a Teaching Assistant (AI), gaining instructional experience that benefits both academic and industry careers. From the third year onward, students participate in annual thesis committee meetings to present research progress and receive feedback from their advisory committee.

The dissertation represents the culmination of years of original research. It must be approved by both the research advisor and a Second Reader before the student can stand for the Final Public Oral Examination (FPO) — the ultimate defense of the doctoral work. Students who complete the General Examination are automatically eligible for a Master of Arts (MA) degree, providing a formal credential at the midpoint of their doctoral journey.

For students with strong materials science interests, the PhD in Chemical Engineering and Materials Science replaces the three technical electives with three MSE 500-level courses and requires a materials-related thesis approved by the Princeton Materials Institute’s academic director. This joint degree program reflects the deep connections between chemical engineering and materials science at Princeton.

MSE and MEng Degree Pathways

Princeton CBE’s two master’s-level programs serve distinct audiences with different career objectives, and understanding their differences is essential for prospective applicants.

The Master of Science in Engineering (MSE) is a research-based degree typically completed within 21 months (by June of the second year). MSE candidates must complete six graduate (500-level) courses in CBE — up to two may be taken outside the department with Director of Graduate Studies approval — and produce a research-based thesis graded by the faculty advisor. The MSE has no teaching requirement, making it a focused pathway for students who want research training without the full PhD commitment.

Some students are admitted directly to the MSE program, while PhD students may request a transfer to the MSE track with DGS approval. However, students who have already received the MA degree through the PhD program cannot switch to the MSE. This policy prevents duplication of master’s-level credentials and ensures clear academic progression.

The Master of Engineering (MEng) is a coursework-only degree with no thesis or research component. MEng candidates must complete eight courses, all taken for a letter grade, with at least six being technical courses and at least four being graduate-level CBE courses. A minimum 3.00 GPA (B average) is required. The MEng can be completed in one academic year full-time or two years part-time, and students always have external support — typically from employers. This program is ideal for working professionals seeking to deepen their technical expertise or pivot into new specializations.

Important restrictions apply to program transfers: MEng candidates may later apply for PhD study, but they are evaluated like all other applicants. PhD or MSE students who received any University financial support may not switch to the MEng track, maintaining clear boundaries between funded research programs and professionally supported coursework degrees.

Core Curriculum and Course Requirements

The Princeton CBE PhD core curriculum establishes a rigorous technical foundation across the fundamental areas of chemical engineering. The five required core courses are carefully sequenced, with most completed during the first year of study.

The first-year fall semester typically includes MAE 501/CBE 509 (Mathematical Methods of Engineering Analysis I), which provides the advanced mathematical tools essential for graduate-level engineering research; CBE 503 (Advanced Thermodynamics), extending thermodynamic principles to complex systems; CBE 504 (Chemical Reactor Engineering), developing the design and analysis framework for chemical reactors; and CBE 507 (Research Topics in Chemical and Biological Engineering), a unique course where each faculty member presents their active research, helping incoming students identify potential dissertation topics and advisors.

The spring semester continues with CBE 510 (Transport Phenomena) or alternatively MAE 552/CBE 557 (Viscous Flows and Boundary Layers), completing the core technical foundation. Students also take EGR 501 (Engineering Ethics) in the spring, and the remaining slots are filled with technical and unrestricted electives chosen to support the student’s research direction.

The elective system provides significant flexibility. Three technical electives must be at the 400-level or above in engineering or natural sciences, while the unrestricted elective can be any course at any level — from foreign languages to public policy. Popular elective areas include molecular simulation (MSE 504/CBE 520), surface science (CBE 526/MSE 526), complex fluids (CBE 543/MSE 525), biomolecular engineering (CBE 438/MOL 438), metabolic engineering (CBE 467), and soft living matter (CBE 433).

Students arriving with prior graduate coursework may request exemptions from core courses, with each exemption reducing the total ten-course requirement. However, CBE 507 cannot be exempted — its role in exposing students to the full breadth of departmental research is considered essential. No exemptions are available for the ethics requirement, technical electives, or the unrestricted elective.

The First Proposition General Examination

The First Proposition is Princeton CBE’s distinctive qualifying examination for PhD candidates, typically taken during the second year. This milestone assessment evaluates not just knowledge of fundamentals but, critically, the student’s creativity and aptitude for independent research — qualities that define a successful doctoral scientist.

The examination consists of two components. The written document is a maximum 15-page, single-spaced proposal that initiates the student’s dissertation research. It must address three fundamental questions: Why is the proposed research interesting and significant? How does it relate to previous work in the field? And is the proposed work feasible, demonstrated through preliminary results? The document — including figures, tables, and appendices but excluding title page, abstract, table of contents, and references — is due at 4:30 PM on the first Friday of December in the second year, a deadline that is strictly enforced.

The oral defense follows in January during the University’s General Examination period. Students deliver a 15-20 minute presentation of their proposed research, followed by questioning from the examination committee. The advisor provides a written assessment in advance and participates in the proceedings but does not assess the student’s performance — that judgment rests with the non-advisor committee members, who evaluate creativity, research aptitude, understanding of the research area, and fundamental CBE knowledge as it pertains to the dissertation topic.

The First Proposition committee structure varies by advising arrangement. Single-advisor students have a four-member committee (advisor, Second Reader, Third Member, and a Fourth Member who chairs), while jointly-advised students have five members with an Extra Member serving as chair. Committee suggestions are due in early November, with final assignments made by the Director of Graduate Studies to balance faculty workload.

Possible outcomes include pass (advancing to post-generals candidacy and MA eligibility), revision of the written document, re-defense, additional coursework requirements, counseling to switch to the MSE track, or — in rare cases — termination. Students who need to re-defend receive only one additional opportunity. The First Proposition must be approved by Commencement of the third year, creating a hard deadline for this critical milestone.

Research Areas and Specializations

Princeton CBE’s research portfolio spans the full breadth of modern chemical and biological engineering, with particular strengths in areas where chemistry, biology, and engineering intersect. The department’s medium size belies the extraordinary depth and diversity of its research activities.

Thermodynamics and Molecular Simulation remain foundational strengths, with researchers using advanced computational methods including Monte Carlo and molecular dynamics to understand phase transitions, self-assembly in nanomaterials, and complex fluid behavior. Surface Science and Catalysis drives innovation in energy conversion, carbon capture, and chemical synthesis through fundamental understanding of surface reactions and material interfaces.

Transport Phenomena and Complex Fluids encompass both classical transport analysis and the fascinating behavior of fluids with complex microstructures — polymeric solutions, colloidal suspensions, and biological fluids whose rheological properties determine performance in applications from drug delivery to industrial processing.

Biomolecular Engineering is perhaps Princeton CBE’s most rapidly growing area, spanning metabolic engineering (designing organisms for biofuel and pharmaceutical production), peptide and protein engineering (creating novel biomolecules for therapeutic and industrial applications), and tissue engineering (understanding how cells organize into functional tissues). The Certificate in Bioengineering formalizes graduate training in this area, covering three thematic domains: molecules, cells, and tissues/organs.

Materials Science and Engineering benefits from the joint PhD program with the Princeton Materials Institute, encompassing polymer science, phase transformations, heterogeneous materials, and materials characterization using advanced techniques. Chemical Reactor Engineering develops the design frameworks essential for scaling laboratory discoveries to industrial production, while Energy and Environmental Engineering applies chemical engineering principles to the critical challenges of sustainable energy production and environmental protection. Students interested in how these research areas compare across institutions can explore our comprehensive university program guides.

Financial Support and Fellowships

Princeton CBE provides comprehensive financial support for PhD students, reflecting the university’s commitment to removing financial barriers from doctoral education. PhD candidates in good standing can expect full funding for five years, covering tuition, a competitive stipend, and health insurance premiums paid by the university. This support comes through a combination of fellowships, Assistantships in Research (AR), and Assistantships in Instruction (AI/TA).

After the standard five-year period, students who have not yet completed their dissertations may enter Dissertation Completion Enrollment (DCE) status for up to two additional years. During DCE, marginal-cost (reduced) tuition is charged, and the default responsibility falls to the student — though advisors may cover tuition and provide a stipend if research funds are available. After DCE, students can maintain degree candidacy in ET/DCC status but without stipend or benefits, creating clear incentives for timely completion.

Several departmental awards recognize excellence and provide additional financial support. The William R. Schowalter Travel Fund is an endowed competitive fund providing up to approximately $1,000 for graduate student travel to professional conferences and meetings, with applications solicited twice per year. The Jui Dasgupta Outstanding PhD Thesis Award recognizes the best doctoral dissertation defended each year, while the Jui Dasgupta Outstanding AI Awards honor the best Teaching Assistant each semester. The Kristine M. Layn Award celebrates outstanding research achievement before the end of the third year.

Students are encouraged to combine funding sources: advisor research grants, departmental awards, and external professional society travel grants (from organizations like MRS, APS, ACS, and the Society of Rheology) can all be applied toward conference attendance and professional development. The department’s proactive approach to travel funding ensures that Princeton CBE students can present their research at major international venues.

Faculty Mentorship and Advising

The advisor-student relationship is the cornerstone of the Princeton CBE graduate experience. The department’s deliberately medium-sized structure ensures that each student receives substantial individual attention, with close working relationships that benefit students whether they pursue academic or industry careers.

The advising process begins during the first semester when incoming students attend CBE 507 (Research Topics), where every faculty member presents their active research. This comprehensive exposure helps students make informed decisions about their dissertation direction. Formal project matching occurs in the fall, and students move into their advisor’s office and laboratory space by January of the first year — beginning their research journey early in the program.

The Director of Graduate Studies (DGS), currently Professor Jamie Link, serves as the primary point of contact for all academic matters, from course planning and exam scheduling to conflict resolution and program transfers. The Graduate Program Administrator (GPA), Karen Oliver, provides essential administrative support for everything from course registration to travel reimbursement. This dual support structure — academic guidance from the DGS and administrative expertise from the GPA — ensures that students can focus on their research while navigating the complexities of graduate school.

PhD thesis committees provide structured oversight throughout the doctoral journey. The committee meets annually from the third year onward, reviewing research progress and providing feedback that keeps dissertations on track. Committee composition is carefully managed: for single-advisor students, the four-member committee includes the advisor, a Second Reader, and two additional members, with at least one from the regular CBE faculty. Jointly-advised students have five-member committees. The DGS makes final committee assignments to ensure balanced workload across the faculty.

Safety is integrated into the advising framework through a dedicated Safety Committee led by Professor David Graves, with a safety manager and representatives from each research group. New students complete comprehensive lab safety training before beginning any experimental work, and ongoing safety oversight is maintained throughout the program.

Career Outcomes and Professional Development

Princeton CBE’s graduate program prepares students for leadership roles across academia, industry, and beyond. The PhD program explicitly aims to develop independent researchers capable of leading innovation, while the strong emphasis on written and oral communication ensures that graduates can effectively convey complex technical ideas to diverse audiences — a skill valued in every professional context.

Professional development is woven throughout the program. The required Teaching Assistant experience develops instructional and communication skills that benefit both academic and industry careers. The annual William B. Russel Graduate Student Symposium (GSS) is a particularly valuable event where advanced students present their research to an audience of industry professionals — many of whom represent companies that are eventual employers. The symposium serves dual purposes as both a research showcase and a recruiting opportunity.

Conference participation, supported by the Schowalter Travel Fund and external awards, allows students to build professional networks and gain visibility in their research communities. The department also hosts a regular seminar series featuring researchers, educators, and entrepreneurs from across academia and industry, exposing students to the full spectrum of career paths available to chemical engineers.

Job postings for permanent and postdoctoral positions in both academia and industry are maintained in the graduate student common area, and the professional connections made during graduate school are described by the department as forming the foundation for lifelong friendships and professional relationships. The combination of rigorous technical training, research excellence, communication skills, and professional networking creates graduates who are exceptionally well-positioned for leadership roles in their chosen fields.

Student Life and Community

Graduate life at Princeton CBE extends well beyond the laboratory, with a vibrant community supported by dedicated spaces, governance structures, and social traditions that make the doctoral journey both intellectually stimulating and personally rewarding.

The Graduate Lapidus Lounge (A214 EQuad) serves as the social hub of the department, featuring mailboxes, a computer and printer, microwave, and a coffee/tea/cocoa machine that fuels countless research discussions and collaborations. First-year students receive office desk space before moving into their advisor’s research group space in January, ensuring a smooth transition from coursework to research life.

Student governance is robust and multi-layered. The Graduate Student Committee (GSC), elected each October with two representatives from each of five year-classes (ten total), meets periodically with the Director of Graduate Studies and serves as the primary channel for expressing student concerns and ideas. The GSC also participates in faculty hiring by interviewing junior faculty candidates and meets with the external Advisory Council, giving students a genuine voice in departmental governance.

Beyond the department, CBE students participate in the Graduate Engineering Council (GEC) with up to two representatives, the Graduate Student Government (GSG) with one representative, and since 2024, graduate students sit on each of the four Graduate School committees through the university’s shared governance framework. This multi-level representation ensures that student perspectives shape policy at departmental, school, and university levels.

Graduate students receive four weeks of annual vacation including all university breaks (winter recess, fall break, spring break), though vacation time may not be accumulated. Building access is provided through RFID card readers on university ID cards, giving students 24/7 access to the Engineering Quadrangle and Hoyt Laboratory for research work. The department’s approach to student life — combining dedicated spaces, meaningful governance, and work-life balance policies — creates an environment where doctoral students can thrive both professionally and personally.