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Meet the Team

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Aimee Esposito
Executive Director
(602) 689-2896 | aimee@treesmatter.org

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 a favorite trees is the Native Mesquite.



Brittany Rinear
Utility Shade Tree Program Manager

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!


Ariel Stone
Outreach Manager
(602) 390-6792 | ariel@treesmatter.org

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 Palo Verde. 


Ali Guttenberg
 Plantings Programs Manager

Ali was born and raised in North Carolina and recently moved to Arizona to join the Trees Matter team. Ali will be working with the Trees for Schools program to expand environmental education for students and teachers. They graduated in May 2021 with a BA in Environmental Studies and a minor in Geological Sciences. They spent many summers working and attending summer camp and are excited to join their passion for the environment and working with kids. Ali deeply values trees for climate change mitigation impacts as well as their beauty. Ali is enjoying learning about Arizona trees and cannot wait to be in the classroom teaching! Outside of work they enjoy hiking, crafting, live music, and are currently learning to play the banjo. Ali’s favorite tree in the Tulip Poplar! 

Paulina Vu
Program Manager
(602) 618-5529 | paulina@treesmatter.org

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.



Keetra Bippus
Social Media & Marketing 2022 Intern
Keetra Bippus is a Journalism major at Arizona State University. She has been passionate about the environment since a kid. She looks forward to learning more about how she can serve her community through Trees Matter! Apart from writing and volunteering, she loves to read and hang out with her cat! Her favorite tree is a Ponderosa Pine.



Oscar Valencia
Fall 2022 Events & Plantings Program Intern
Oscar is currently an ASU senior studying Sustainability with a focus in ecosystems sustainability. He loves to go hiking and camping, and wants to help build a more sustainable city. He can’t wait to make a positive contribution to the community and start off his professional career with such an impactful organization. His favorite tree is the Blue Palo Verde because they provide shade and a snack during spring!



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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      (602) 689-2896 | 734 W. Polk St, Phoenix, AZ 85007