The University of Arizona Campus Arboretum Advisory Board

Dr. Tanya Quist is the director of the University of Arizona Campus Arboretum, and an Associate Professor in The School of Plant Sciences. She earned a Ph.D. studying plant environmental stress and M.S. and B.S. degrees in horticulture science. She advocates for responsible landscape practices which protect urban trees and support sustainable landscape management. 





Mark Dimmitt, Ph.D, hearned degrees from Pomona College, UCLA, and UCRiverside, and has authored more than 50 scientific and popular publications about ecology and horticulture. His major publication is the plant and ecology chapters of A Natural History of the Sonoran Desert (2000), and he is the senior editor of the revised edition (2015). He is coauthor of the book Adenium: Sculptural Elegance, Floral Extravagance (2008). In addition to being a Fellow of the Cactus and Succulent Society of America, Mark is a renowed plant breeder focused on hybridized Trichocereus, Tillandsia, Adenium, though also known well for his role in selecting the widely used 'Desert Museum' palo verde. Mark also collects and grows a number (possibly 1000s) of other weird plants, mostly succulents and epiphytes at his home and greenhouses in west Tucson.

John Bramley, Dr. A. John Bramley, born and educated in the United Kingdom, is a microbiologist with degrees from the University of Newcastle upon Tyne and the University of Reading. After a government research career in England he moved to the University of Vermont where he served as a Professor, Chair, Dean, Provost and Interim President. Following his retirement to southern Arizona his interest in plants and horticulture drew him to the University Arboretum which he sees as both a place of beauty and an expression of the University Land Grant Mission of outreach.
Nick Shipley, co-owner and Chief Operations Officer of Civano Growers was born in Nova Scotia, Canada. He is an ISA Certified Arborist. From 1997-2004 he served as Reclamation Manager for Civano Nursery, Inc. where he oversaw salvage of trees and cacti from development sites. From 2004-2017 he served as Farm Manager of Civano Growers where he oversaw all aspects of plant production at the nursery. Nick was raised in the horticulture industry and started working summers in his father's greenhouses at the age of 11. he has an incredible passion for plants and is driven to see them thrive in our urban landscapes. 
David Yetman is an academic expert on Sonora, Mexico and an Emmy award-winning media presenter on the world's deserts. He is a research social scientist at the University of Arizona. Yetman is a known as the 'voice' for the people and desert regions of the south-west USA and Northern Mexico. His publications date back to the 1980s and often deal with the plant use of particular tribes and peoples.

Richard Wiedhopf is the President of the Tucson Cactus and Succulent Society and one of the founders of its rescue program that has saved more than 95,000 cacti and succulents from destruction. He served the University in the College of Pharmacy for more than 50 years and retired as Assistant Dean for Finance and Facilities and Curator of the History of Pharmacy Museum. He was an early officer and board member that helped establish the Tucson Botanical Gardens. 


Peter Dourlein is the Assistant Vice President for Planning, Design & Construction and Campus Architect for the University of Arizona. He is currently on the board of directors of the Southern Arizona Chapter of the American Institute of Architects, a member of the Metropolitan Pima Alliance, and serves in numerous design and construction industry organizations and associations. He is an accredited professional with the US Green Building Council’s Leadership in Energy and Environmental design certification program. 
Jane Evans was born and raised in Tucson and graduated from the University of Arizona with a B.S. in Plant Science in 1976. After a brief one year stint as Assistant Extension Agent at the Tucson Garden Center Jane struck out on her own. She purchased the Garden Flower Shop property at 2936 N Stone in 1978. In 1986 her not yet husband, Gene Joseph, started Plants for the Southwest, a cactus and succulent nursery,  on this property and Jane and Gene continue to run the nursery to this day. This property is the longest continuous nursery property in Tucson! Growing Lithops, a South African Succulent is her speciality however her plant interests are wide ranging. 

Sandra Obenour-Dowd is the Grounds Superintendent for the University of Arizona. She earned her B.S. degree in Horticulture from Texas A&M University. From wholesale and retail nurseries, to tissue culture at the Biosphere, to golf course horticulturist, to university grounds maintenance, she has a deep horticultural background. Sandra has lived in all three of the southwestern United States deserts and has a great interest in promoting the beauty and functionality of native and adapted plants in the landscape.



Bethany Vos is an undergraduate student pursuing two degrees: one, in Nutritional Sciences and one in Plant Sciences. She expects to graduate in 2021. She is an exceptionally organized, meticulous student who has enrolled for course credit doing projects for the Campus Arboretum. Most recently, she has assumed responsibility for curating the arboretum's extensive botanical photo inventory. As the Campus Arboretum photographer, she ensure all plants in the collection have botanically identifying photos, publishes these to the web and maintains accuracy of all records, including updating current taxonomic classification in the database. As a member of the board, Bethany assists by organizing meetings, compiling the agenda, taking minutes and providing valuable perspectives and insights.




Margaret Pope is a scientific illustrator who has done commissioned work for private individuals, businesses and organizations.  Solo exhibits of her work have been held at Tohono Chul Park  and  Tucson Botanical Gardens and her work has been juried into both local and international exhibits. She has also curated several exhibits. In 2008 she began The Sonoran Desert Florilegium Program, a non-profit organization sponsored by the Tucson Cactus and Succulent Society, whose mission it is to promote and preserve botanical art of the Sonoran Desert region.  Prior to becoming an artist Margaret received a B.S. in Science, from the University of San Francisco and a Masters in Public Health and Nurse-Midwifery from The Johns Hopkins School of Hygiene and Public Health.  She was in the Peace Corps in India from 1965 -1968 and worked as a nurse-midwife on the Navajo Reservation and in Tucson from in 1970 through 1979.  


Dr. Steven Leavitt, Steven Leavitt has a B.S. degree in Geology from the University of Illinois, M.S. in Environmental Sciences from the University of Virginia, and Ph.D. in Geochemistry from the University of Arizona. Leavitt is the Associate Director of the Laboratory of Tree-Ring Research at the University of Arizona. His specialty is isotope dendrochronology as applied to paleoclimate and ecology questions. He has been author or co-author on more than 150 papers, and has been Principal Investigator or Co-Investigator on 20 grants from various agencies including National Science Foundation, U.S. Dept. of Agriculture, U.S. Dept. of Energy, and National Oceanic and Atmospheric Administration.  Leavitt teaches classes related to global change, biogeochemical cycles and isotope dendrochronology, and he has also been editor of the international journal Tree-Ring Research since 2001.

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Juan Barba Juan Barba is a Consulting and Working Arborist, the owner of Juan J. Barba & Associates in Tucson, Arizona.  Holding a degree in Environmental and Landscape Horticulture from the UofA and ISA Arborist Certification, Juan has practiced in and instructed all facets of arboricultural & horticultural care around Arizona and many other states.  A native Tucsonan who enjoys traveling, he is a past president of Western Chapter, ISA and a former chair of Trees for Tucson.



Ann Audrey is an alumna of the U of A, and has spent many happy hours over the years walking among the wonderful trees in the Campus Arboretum. As a board member, she tirelessly uses her experience as a fundraiser and expertise in running non-profits to help with marketing, fundraising and landscape development. 





Profile image for Ross Charles CoelhoJudith Ratliff (MLA, UA 1991) has been designing Tucson landscapes for 25 years. She's also known for the articles she's written on plantings, design issues and architecture for various publications. 









Profile image for Ross Charles CoelhoLori Woods earned her Landscape Architecture degree from the UA and works with RECON Environmental, Inc. She is native Tucsonan, with a passion for Sonoran desert conservation and habitat restoration. Ms. Woods provides design consultation assistance to Dr. Quist for key areas of the Campus Arboretum that are prioritized for revitalization, giving careful consideration to their historic context.