Meet the Team


Ariel Stone
Volunteer & Outreach Manager
(602) 390-6792 |

Ariel is an Arizona native, having grown up in downtown Phoenix. She graduated from ASU with a BS in Nonprofit Leadership and Management, and has volunteered for nonprofits since a young age. She volunteered with Trees Matter while a freshman at ASU and is glad to be back as part of the team! Ariel values the importance of trees and other plants native to the desert southwest, and is particularly interested in ensuring that they thrive in a rapidly growing urban setting. While she’s excited how fast Phoenix has been growing both culturally and economically in recent years, she believes Trees Matter can have impact on making sure this growth happens in the most sustainable way. She loves traveling, drawing, yoga, and live music. Ariel’s favorite tree is the Parkinsonia, or Palo Verde. 

Brittany Rinear
Customer Communications Coordinator

Brittany has an extensive background in customer service, and is passionate about supporting our organization. After graduating from McClintock High School in Tempe, she lived in Portland, OR, and Santa Rosa, CA, where she developed a deep appreciation for ocean winds and cypress trees. Brittany is now a visual artist, creating and selling abstract paintings with various mediums, and is a ceramics student at Phoenix Center for the Arts. Her passion for gardening is mostly limited to indoor plants, especially in the summer! After providing occasional support for past projects, she is excited to move into a more substantial role at TM!

Paulina Vu
Program Manager
(602) 618-5529 |

Paulina was born in Arizona, and recently graduated with a concurrent degree in Sustainability and Global Studies. Her interest in sustainability in a local and global stage has led her to various projects, volunteering, and internships with organizations such as the Gaia Association, The International Rescue Committee, and the Arizona Department of Environmental Quality. Paulina is passionate about community engagement, and is excited to work towards a healthier, happier Phoenix. While at ASU, she was an intern for Trees Matter and is thrilled to join the team once again. She has always been in awe of nature and loves to hike, take photos, travel, and board games in her free time. Her favorite tree is the Hong Kong Orchid.

Olivia Diaz
Americorps Vista Member

The emphasis of Olivia's work is in our Trees for Schools program, furthering education on the importance of trees to students! Olivia was born in Hawaii and raised in Phoenix. She graduated from Oregon State University with a BS in Natural Resources. During her time at OSU she studied and interned in Gabon, Chile, and Borneo. Upon graduation in 2017, she joined the Peace Corps and served for 2 years as an agroforestry volunteer in Southern Province, Zambia where she worked with her community on projects like beekeeping, tree planting, and climate smart agriculture. She also enjoyed being an after-school environmental educator both in Zambia and Oregon. She loves to bike, hike, travel, learn new languages, and play string instruments. Olivia's favorite tree is Masuku, Uapaca kirkiana

Aimee Esposito
Executive Director
(602) 689-2896 |

Aimee is a native Phoenician, growing up next to Piestewa Park. She has always had an appreciation for both the function and beauty of the desert environment. Aimee attended ASU where she learned the importance of bridging fields, receiving a BS in Geography and a BA in English Literature. Later Aimee ventured to Monterey, California where she spent two years earning a Master's degree in International Environmental Policy. Aimee returned to the Valley and has been with Trees Matter since 2013 becoming Executive Director in 2016. She is currently studying to become a certified arborist. Aimee’s favorite tree changes often but one of her favorite trees is the Prosopis juliflora, or the Native Mesquite..


Elsie Mason
Fall 2020 Advocacy Intern

Elsie is an Urban Planning, Sustainability, and GIS student at Arizona State University. When she isn’t studying human populations, she is managing honeybee populations for pollination services in Arizona, the Navajo Nation, and California! She hopes to work for a municipality to aid in fair growth and to mitigate disaster risk. She is excited to be part of the Trees Matter team for a 2020 fall internship. Joining a shared vision to increase the valley’s tree canopy and promote sustainability goals is both meaningful and rewarding. 


Aaron Serva
Fall 2020 Events Intern

Aaron is a Sustainability major at Arizona State University, and will completing his capstone senior internship with Trees Matter. Camping has always been a large part of his life, and it is through camping where he developed an interest in nature, with a particular interest in birds and trees. Outside of camping, his interests include playing video games! His future goals are to graduate with his bachelors degree, and to become an individual with a deeper understanding of and within the sustainability movement. He believes that by working with Trees Matter, he can make those goals come to fruition, and he is excited to gain quality experience and lessons from this internship He looks forward to working with Trees Matter staff and our community!⁠

The Office

734 W. Polk St. Phoenix, AZ 85007

Mailing Address

PO Box 2648 Phoenix, AZ 85002

Our office is in the building of The McKinley Club, a co-sharing workspace. Feel free to ask around--we all know each other. We look forward to seeing you soon!

If you want to mail something to us please use our mailing address listed on the right.

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