Join Our Cause

Help us work towards another successful project implementation. Our work would not be possible without the generous team of supporters that design, build and report on our projects. Not an engineer? No problem! Our organization goes beyond engineering and we would love your support with grant pursuit, fundraising, education curriculum development, website and social media support, or any other ideas that you can bring to the table. Now is the time to get involved! Click below to donate or join our team as a volunteer.

Callie Charleton, President

Callie graduated from Cal Poly, San Luis Obispo with a bachelor’s in environmental engineering in 2021. She became involved with EWB in 2018 helping to start a chapter at Cuesta College and presenting about the experience at the 2019 EWBUSA conference. In 2020, she authored a paper and presented it at the American Society for Engineering Education conference on the collaboration between community colleges and 4-year colleges in EWB. Outside of engineering, she enjoys travel, having been to 20 countries and lived in Spain teaching elementary school English.

Becca Keating, Vice President

Becca graduated with Bachelor’s Degrees in Engineering and Astrophysics from Swarthmore College in 2023. Since graduation, she has been a practicing electrical engineer at a construction engineering firm, specializing in pier and wharf applications. She heard about the Sonoma Chapter of EWB in 2024 and has been an active member ever since. Outside of work, Becca can usually either be found knitting or soaking in nature.

James Whittall, Fundraising Lead

James graduated from Cal Poly, San Luis Obispo with a bachelor’s degree in Architectural Engineering. He has four years of experience working in Sonoma County and specializes in custom residential design. James is passionate about the intersection of design and engineering in architecture, and the sustainable future of structural design.  James joined EWB in 2022 to help use his education and skills to improve the lives of those in less developed areas. When he isn’t at the office, James likes to climb, run, ride bikes, and read.   

Christine Strong, Project Lead

Christine studied Civil Engineering at Cal Poly, San Luis Obispo, with an emphasis on structural design. She has been practicing structural engineering since 2020, including some time in residential design before moving into her current role in the temporary structural design and construction industry. Christine enjoys a busy schedule, filling her days with practicing yoga, cooking with friends, exploring local hiking trails, and picking up new hobbies.

Dasan Howell, Design Lead – Reports

Dasan is an Electrical Engineering student at Santa Rosa Junior College who joined the Sonoma Chapter of EWB in the summer of 2025. In his free time, he enjoys barbecuing, staying active at the gym, and caring for his ant farms.

Kevin Marx, Design Lead – Drawings

Kevin Marx graduated with a bachelor’s degree in architectural engineering from California Polytechnic State University, San Luis Obispo. Kevin has practiced structural engineering for 8 years in Sonoma County and specializes in winery, residential, and essential service structures. He joined EWB in 2021 and recently help implement the Amazonas 2023 system. Beyond EWB, you can find Kevin playing sports or experimenting in the kitchen.

Teddy Stebbins, Design Lead – Schedule & Budget

Teddy graduated from UC Davis with a bachelor’s degree in Environmental Engineering and a minor in Sustainability in the Built Environment in Summer 2025, and started his career at Summit Engineering soon after. As a previous EWB member at the Davis Chapter, Teddy hopes to carry his prior knowledge and experience with EWB and water treatment systems over to Sonoma and become a valuable member of this amazing team! When he’s not behind a desk or in the field, Teddy enjoys spending time with his girlfriend and their two cats, playing board and card games with friends, and getting outside for a hike or sports!

Taylor Belisle Lopez, Secretary

Taylor graduated with a bachelor’s degree in Chemical Engineering from UC Santa Barbara, where he also competed as a member of the Olympic-style weightlifting team. He joined EWB in 2024 soon after beginning his current role as a water/wastewater engineer, hoping to use his developing expertise to assist those in need. Beyond engineering, Taylor has a passion for hiking, music, and baseball.

Chuck Corley, Mentor

Chuck graduated with bachelor’s and master’s degrees in Electrical/Electronic Engineering from California State University Sacramento. Chuck retired from his career in 2021. Our longest standing volunteer, Chuck joined EWB in 2015 with a desire to use his engineering skills to help people. Outside of EWB, Chuck adventures through the outdoors – biking, hiking, skiing and snowboarding.

Ryan Krostag, Mentor

Ryan Krostag graduated with bachelor’s and master’s degrees in Civil Engineering from California Polytechnic State University, San Luis Obispo. Ryan joined EWB in 2020 to help people with limited opportunities to increase their quality of life in ways that can be passed down to future generations. Outside of work, Ryan perfects his home brewing recipes and shares the exploits with friends and colleagues.

Joe Giesa, Mentor

Joe Giesa graduated with a bachelor’s degree in Civil Engineering from California Polytechnic State University, San Luis Obispo. Joe is a practicing engineer with 6 years experience in Sonoma County. He joined EWB in 2021 because of welcome suggestions from friends and colleagues to combine his passion for volunteer work with his industry experience. Joe loves playing guitar and making music.

Dennis Johnston, Mentor

Dennis graduated with a bachelor’s degree in Architectural Engineering from California Polytechnic State University, San Luis Obispo. Dennis recently moved into construction in WA state after 4 years practicing as a structural engineer. He joined EWB in 2017 to help use his education for good. Outside of work, Dennis is usually enthralled in whatever random hobby has caught his eye, from ceramics to mountain biking.