The University of Calgary is recruiting PhD students and postdoctoral researchers in mathematical modeling, optimization, and renewable energy systems, with joint appointments in the Department of Mathematics and Statistics and the Department of Earth, Energy and Environment. The PhD positions are available for the Fall 2026 semester through either the Mathematics and Statistics or Geoscience programs. Research areas include mathematical modeling and optimization for power and energy systems, with applications in renewable energy, atmospheric modeling, wind and solar farm modeling, transmission and generation planning, and electricity markets. The programs offer opportunities to work on interdisciplinary projects at the intersection of mathematics, statistics, and earth sciences, and to collaborate with leading faculty members. Applicants should have a strong background in mathematics, statistics, geoscience, or related fields, and demonstrate a passion for research in mathematical modeling and energy systems. International applicants must meet English language proficiency requirements. Funding for PhD students is competitive and may include stipends and tuition coverage; details are available through the university's Graduate Calendar and departmental awards. The postdoctoral position, hosted by the Pacific Institute for the Mathematical Sciences (PIMS) at the University of Calgary, is a one-year fully funded opportunity with a minimum salary of 57,000 CAD plus benefits, and may be combined with sessional teaching. The postdoc will join a collaborative research group focused on forecasting and mathematical modeling for renewable energy, with opportunities for networking and interdisciplinary research. Application deadlines for both PhD and postdoc positions are January 15, 2026, with review of postdoc applications beginning December 5, 2025. Prospective PhD students should contact Zhirui Liang directly by email with their application materials, while postdoc applicants should apply via mathjobs.org and arrange for a faculty sponsor. For more information, visit the provided program and faculty links.