Faculty and Staff
- Phone: 507 222 4884
- Fax: 507 222 5757
Dr. Bosacker is a zoologist, and her primary research interest is in the social behavior of primates. She studies a population of baboons living in Gombe National Park, Tanzania. She is particularly interested in how social circumstances influence an individual’s exposure to stress and how the negative effects of stress might influence the evolution of social behaviors. Dr. Bosacker is currently acting as the director of Carleton’s Coastal Marine Ecology program in Australia. Dr. Bosacker teaches Behavior Ecology, and a lab for Genes, Evolution and Development.
Dr. Crutchfield is a Carleton College graduate (’82) biology major. He is a board certified dermatologist with a clinical practice in Eagan, Minnesota. In addition to his M.D. degree, Dr. Crutchfield also has a Master’s degree in Molecular Biology from the Mayo Clinic. He has co-authored the dermatology textbook ‘A Clinical Atlas of 101 Common Skin Diseases’ and authored over 100 scientific articles and publications. His research interests include psoriasis and ethnic skin disorders. Dr. Crutchfield teaches the spring upper level biology seminar “Cutaneous Biology for the Pre-Medical Student”. Carleton BA; Mayo, MA, MD.
Sarah is trained as an invertebrate biologist with a focus on endosymbiotic relationships in marine invertebrates. She is interested in how students best learn new concepts and skills in biology, and in how students utilize research experiences to deepen their understanding of biology. At Carleton, she has been involved with laboratory sections of Intro Biology, Animal Physiology, and Genetics. Currently she is developing, preparing, and teaching labs for Intro Biology I: Energetics and Genetics (Biol 125).
Dr. Hernandez is an ecosystem ecologist researching the effects of changes in plant communities (from disturbance, herbivory, and loss of biodiversity) on carbon and nutrient cycling in savannas and grasslands. Current research includes investigating the consequences of nitrogen deposition and cattle grazing on serpentine grasslands in California and the role of mammalian herbivores in the structure and function of restored prairies in the Arb. He teaches courses on Ecosystems Ecology, Global Change Biology, Grassland Ecology, and Introductory Biology.
David Hougen-Eitzman, senior lecturer (St. Olaf College, BA; Duke University, PhD), teaches entomology and introductory biology, as well as an agroecology class that visits China. He is Farm Club’s adviser and is conducting research on sustainable agriculture.
Bridget Jacques-Fricke, visiting assistant professor (University of Minnesota, Morris, BA; University of Wisconsin, Madison, PhD), teaches human physiology, neurobiology, and introductory biology lab. Her interests include cell motility, particularly neural crest migration during vertebrate development.
Andrea is a developmental biologist pursuing her postdoctoral research at Carleton College in Jennifer Ross Wolff’s lab. She received a B.S. in Marine Biology from Eckerd College in 2003 and a Ph.D. in Molecular, Cellular, Developmental Biology and Genetics from the University of Minnesota in 2010. Andrea’s research focuses on the sexual specification of ventral cord neurons in the nematode worm C. elegans. She teaches the Evolutionary Developmental Biology (Evo-Devo) seminar.
Research Supervisor of Cowling Arboretum
Dr. McKone is an evolutionary ecologist, pursues research on the interactions between insects and plants. Particular interests include the pollinator community of prairie composites and the evolutionary impact of pre-dispersal seed predators of grasses. He teaches Evolution, Population Ecology, Evolution of Sex and Sexes, and part of Introductory Biology.
Dr. Mitra is a molecular and cellular biologist interested in the interactions between plants and microbes. Her lab studies bacterial pathogens of plant roots with the goal of understanding disease development and plant defense. Current lab projects involve elucidating the role of bacterial effector proteins in pathogenesis of the model plant Arabidopsis thaliana. Dr. Mitra teaches courses in Microbial Pathology, Cell Biology, and part of Introductory Biology.
Dr. Petricka is a plant developmental and systems biologist interested in root development and response. She studies the development of the Arabidopsis thaliana root and its responses to environmental stresses. She teaches courses in Genetics and Plant Development.
Director of Neuroscience
Dr. Rand, a vertebrate reproductive biologist, studies the hormonal mediation and function of sexually dimorphic traits. Currently he is looking at the role of genes in determining pigment differences in Sceloporus lizards. He teaches Animal Physiology, Vertebrate Morphology, a seminar on Behavioral Genetics, part of Introductory Biology, and a non-majors course that explores the biological basis of reproduction and sexuality in Humans.
Dr. Singer is a plant developmental biologist, is taking a developmental genetics approach to the study of flowering in pea. Floral mutants are being characterized and genetic interactions between mutants are under investigation to elucidate the roles of different genes in the regulation of inflorescence architecture. Specific interests include the evolution of floral developmental pathways. She teaches Plant Biology, Plant Development, Genetics, and part of Introductory Biology.
Dr. Tymoczko is a biochemist, teaches upper level and introductory level Biochemistry courses, a seminar on The Metabolic Basis of Human Disease, part of Introductory Biology, and a seminar on Exercise Biochemistry. He has recently co-authored three editions of Stryer's Biochemistry, and is currently working on the 8th edition. He has also co-authored two editions of an introductory level biochemistry text, and is beginning work on the third edition.
Faculty Director of the Center for Community and Civic Engagement
Professor of Biology
Dr. Walser-Kuntz is an immunologist, is interested in the role the immune system plays in the development of autoimmune disorders and the potential impact on this process of environmental contaminants. We are testing how a common plastic component, bisphenol A, affects immune cell activation and cytokine responses. She teaches Immunology, Microbiology, part of Introductory Biology, a seminar on Topics in Virology and Methods of Teaching Science.
Director of Neuroscience
Head Coach, Men's Tennis
Professor of Biology
Dr. Zweifel is a geneticist and molecular biologist, is examining the replication and segregation of mitochrondrial DNA in the yeast S. cerevisiae. His lab is interested in identifying and characterizing the nuclear genes responsible for the proper transmission of the mitochondrial genome. He teaches Genetics, Molecular Biology, part of Introductory Biology, and a seminar on Behavioral Genetics. Dr. Zweifel is Chair of the Department.
Dr. Wagenbach, an invertebrate zoologist worked on the population biology of threatened freshwater mussels in regional rivers. He taught a variety of courses during his 39 years at Carleton including at off-campus locations, environmental studies courses, and served a stint as Director of Environmental and Technology Studies. At present he is helping with teacher professional development in a new K-12 school in Yangon, Myanmar (Burma).
Professor of Biology
Dr. Jaramillo is a neurobiologist interested in sensory systems. His work focuses on the hair cell, the mechanosensory receptor of the auditory, vestibular, and lateral line systems. Current research interests include the study of mechanoelectrical transduction, molecular motors in the hair cell, the role of noise in sensory processing, and the physiology of synaptic transmission. He teaches Cell Biology, Neurobiology, and Human Physiology.
Assistant to Pre-Health Advisor
B.A. (cum laude), Concordia University, Organizational Management and Communications. She manages all aspects of department events, recruitment searches and guest speaker visits (budgets, scheduling, publicity, transportation, accommodations, catering). Provides organizational and administrative assistance for Chair and faculty. Oversight of department budget, catalog, and course schedule, along with faculty VISA statement review. Track majors’ Biology course requirements and comps completion. Builds and maintains Biology Department Website and department Facebook page. Works directly with Student Departmental Advisers (SDAs), Department Curriculum Committee (DCCs), and serves as the Student Work Supervisor for the Biology Office. Fields department and campus questions for students, staff, faculty, alumni, and visitors.
Puzak Family Director of the Cowling Arboretum
Nancy Braker (BA Carleton; MS University of Minnesota - Entomology) is a conservation biologist. She has 20 years of experience working for The Nature Conservancy in land management, conservation planning, and monitoring of rare species populations, specializing in management of fire adapted natural communities. Nancy oversees all aspects of management of the Cowling Arboretum and McKnight Prairie, and works with faculty, students and outside users on research and use of the properties.
Shawn is a cell biologist who has an unhealthy fascination with microscopy. His interests have led him to previous work on cellular adhesion, phototoxicity in fluorescence microscopy, and a survey book chapter on microscopy techniques. As the former chair of a national postdoctoral subcommittee, he also enjoys talking about career options both inside and out of the scientific community. He is responsible for maintenance of all of the department's scientific equipment, as well as coordinating reagent preparation and distribution to the faculty -- with lots of student help!
Randy has a BA in Geology from Gustavus Adolphus College and both an MA in Anthropology and MS in Plant Sciences from the University of Arizona. Prior to joining the Biology department at Carleton in 2009, he had over 20 years of research and commercial experience in plant propagation,hydroponic growing and greenhouse production. Randy serves as supervisor of the biology greenhouse, zebrafish lab, and animal colony facility. Current research interests include testing new lighting systems, propagation of rare plants,and development of improved hydroponic/aeroponic systems growing systems.