Our Staff and Board of Directors

Dave Irvine

Executive Director

Dave Irvine became the Executive Director of the Highlands Center for Natural History in January of 2008. Mr. Irvine brings in over 25 years of experience working with non–profit, science education organizations as a naturalist, program director and executive director. Most recently he was the Director at the Cuyahoga Valley Environmental Education Center in Northeast Ohio, which was operated in partnership with the National Park Service. He was also a past President of Environmental Education Council of Ohio and has worked for other organizations in Colorado, North Dakota and Ohio. Originally from Pittsburgh Pennsylvania, Mr. Irvine holds a BS degree from Penn State University in Parks & Recreation with an emphasis in Environmental Interpretation and has done graduate work at Antioch College in Yellow Springs, Ohio.

Andrew Sweeney

Associate Director

In 2010, Andrew moved to Arizona into a Program Director position for a residential and day camp located in the Prescott National Forest.  Growing up in the beautiful State of Maine, Andrew had access to the Appalachian Mountains where he spent much of his time backpacking, running and skiing.  His affinity for the outdoors still remains, and can still be found hiking and camping in the pines, and riding his bike around town.  Prior to his move to Arizona, Andrew received his Bachelor of the Arts from the University of Maine in History, Sociology, and Anthropology.  He continued his post-graduate work at University of Bridgeport and receive his teaching certificate while working in secondary education in Connecticut.

Sarah Vincent

Education Director

As a member of the Education team at Highlands Center for Natural History, Sarah brings passion for science, love for education, and rootedness in the communities she serves. As a young scientist, Sarah obtained a B.S. in Earth Science from George Mason University, with research opportunities in freshwater ecology and geomorphology. After working as an outdoor educator and field guide from the Chesapeake Bay, to the Grand Staircase Escalante, her desire to become an educator evolved leading her to receive a M.Ed. in Secondary Education from Prescott College. Sarah brings experience in environmental and educational leadership – constantly learning from and celebrating the communities that make up the Central Highlands, human and non-human. She works hard to facilitate meaningful experiences for people in nature, about nature, and most importantly, with nature.

Jessica Manley-Ewald

Education Coordinator

Jessica is a native of California, but has lived in Arizona since 1994 when she came here to attend college and received her Bachelor of Science in Soils from Northern Arizona University. Jessie spent some years working for Sharlot Hall Museum, and then at the local government level, but never lost her passion for the natural sciences. She started as a volunteer for the Highland Center helping with the Knee High Naturalist program, working in the store, and special events. Jessie later transitioned to the Americorps program assisting the Education Department, and now she is a permanent member of our staff.

Erin Nixon

Education Coordinator

Erin was born and raised in southern California and earned her Bachelors of Science in Zoology at Washington State University. In 2021, she earned her Masters of Science in Biology with an emphasis in Adult Education from Grand Canyon University. Prescott has been her home since 2017 and started her career in outdoor education as an education facilitator and program coordinator at Chapel Rock’s Aspen Creek Outdoor School. She has also been a docent at Heritage Park Zoological Sanctuary since moving here. She spent summers programming for YMCA summer camp and the Discovery Center at the Anchorage Museum in Anchorage, Alaska. In all of her work she has been fostering a passion for science and the outdoors.

Melissa Church

Schoolyard Habitat Coordinator

Melissa grew up in New England and spent much of her time exploring the mountains, lakes, and rugged coastline of the northeast. Her love for nature and spending time outside led her to pursue a major in environmental science at Lyndon State College in Vermont, where she received her Bachelors of Science in 2014. While in college, she began working for the Massachusetts Audubon Society and was able to work with campers and teach them about many unique and diverse ecosystems, including Martha’s Vineyard. Melissa also loves traveling and has explored much of the west coast – working for a number of non-profits, including Seattle Audubon Society. When not working Melissa enjoys spending time outside whether it Is hiking, skiing, or rock climbing.

Sonya Wood Mahler 

Membership Database and Volunteer Coordinator

Sonya has been teaching youth and adults about environmental education and outdoor exploration for 35 years. After careful study of the Winnie the Pooh children’s stories, Sonya’s family decidedly claims that she is half Owl and half Tigger. She is driven to teach those around her but she loves to encourage them to play too.

Sonya grew up on the Alabama Gulf coast. She has degrees from Auburn University and the University of Wisconsin-Stevens Point. For the first 20 years, she was a marine biologist and marine cooperative extension agent. She has worked as program director for environmental education centers, nature center naturalist, planetarium interpreter, aquatic education specialist, and watershed educator. Sonya has led 65 kayak trips and 53 manatee dive trips. She also leads hikes, caving trips, stargazing, and storytelling.

Sonya and her husband Larry participate in work mission trips in Mexico, where they build schools, libraries, health clinics, and drinking water systems. Some of Sonya’s favorite things are travel, photography, theater, bike riding, SCUBA diving, gardening, hiking with her dog Prancer, shrimp, fresh raspberries, and ice box pecan pie.

Jess Talosi

Facilities & Property Director

Jess joined the Highland Center in 2019.  He has held previous roles as a business owner in the tree service industry, Arizona licensed contractor, patrol deputy and maritime captain.  His varied background provides a broad knowledge of skill sets to assist in maintaining the Center.  Jess was introduced to the Highland Center as one of his customers, where he developed a relationship with the staff and an appreciation for all the Center provides.

Jess grew up in San Pedro, California and then spent many years in Washington State.  He and his wife and son moved to Prescott in 2015 to be closer to family and enjoy all the Prescott has to offer. He enjoys hiking, mountain biking, gardening and the sunshine!!

Tom Agostino

Marketing Coordinator

Tom has an unusual, and colorful, history in the Marketing and Communication field. During his seventeen years living in Los Angeles and working in the entertainment industry he co-produced the “The Imperial Bells of China”, the largest group of Chinese artists that ever toured the US, twice. He also worked closely with Tai, the amazing Indian elephant that starred in the movie, “Water for Elephants,” when he founded The LA Circus, an award-winning one-ring community circus sponsored by the City of Los Angeles. Tom also worked on several of the largest Music Festivals of the 90s, including the Amnesty Int’l World Tour w/ Peter Gabriel, Sting and Bruce Springsteen, Fiesta Broadway, and the US Festival. As Tom says, “After running a circus for two years, there’s not much that can surprise me. If you can deal with a dozen clowns on a daily basis, everything else is a piece of cake.” Thirteen years ago, when Tom moved to Prescott, he started the Folk Sessions Radio Show, still broadcasting on the KJAZZ Radio Network. He received a Bucky Award for Media in 2013, performs at church halls and folk fests with his wife, Christa, and is proud to be a “Man Who Cooks”.

Chaz Gilmore

Site Host

Chaz is brand new to Arizona and the Prescott area. He was born and raised in Casper, WY. He then went to the Boulder College of Massage Therapy in Boulder, CO. Chaz’s passion is Massage which led him to take an instructing role at the Arizona School of Integrative Studies here in Prescott. Chaz and his two cats took the journey here in his RV. He also loves the outdoors and came upon the opportunity to live as the site host here at The Highlands Center for Natural History. It has been one of the most unique living opportunities Chaz has done and he has fallen in love with the Prescott National Forest and is so grateful for the chance to help maintain the Center.

Our Board of Directors

Norm Meier
Board Chair

Mary Krzysik
Vice Chair

Lee Atonna

Michael Bacci

Ann Baugh

Pam Catlin

John Huff

Mary Ann Mira

Peter Percy

Neal Sneller

Greg Stewart

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