Our Team

Meet The Team

Joe Baumann

Director of Multifamily Services

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Joe holds a BA from University of Georgia and a JD from Georgia State University College of Law. Before joining SK Collaborative, he worked in the Atlanta Mayors office of Sustainability, as a Legal Fellow for the Atlanta Beltline, a Research Assistant at the Andrew Young School of Policy Studies, and as a Policy Intern at Southface.

He manages multifamily certification work including projects certified under EarthCraft Multifamily and Communities, National Green Building Standard (NGBS), Enterprise Green Communities, and LEED for Neighborhood Development. He is a RESNET certified HERS rater, a LEED Green Associate an EarthCraft Technical Advisor, and an NGBS Green Verifier.

Emily Bunce

Green Building Project Manager

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Emily is an Atlanta native and graduated from Georgia Tech with a Civil Engineering degree. She has a background in building enclosure consulting and has earned her EIT and REWO. In her spare time, she enjoys being outdoors and exploring different Atlanta hiking spots.

Carlos Corrales

Green Building Project Manager

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Carlos Corrales grew up in Orange County, California, and has lived in several areas of the country during his nine years in the Marine Corps. After completing his final enlistment in 2015, Carlos received his Bachelor of Arts in sustainability from San Diego State University, which ties together his passions for construction and environmentalism. He is a LEED Green Associate and holds a GPRO certificate.

Outside of the office, Carlos spends time biking all across Atlanta and trying out new restaurants with his wife, especially along Buford Highway. He’ll never turn down a quality taco.

Rachel De Las Casas

Green Building Consultant & Marketing Associate

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Rachel is our newest addition to the team! Rachel started as our first intern, and quickly fell in love with green building for its interdisciplinary approach grappling real-world issues within the built environment that impact health and sustainability. She came onboard full-time after graduating from Agnes Scott College with a B.A in Public Health and looks forward to a long career in building better for people and our planet.

When off the field and out of the office you can find her gardening, raising chickens,  hiking and fishing!

Andrew Doetsch

Green Building Project Manager

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Andrew graduated from Emory University with a BA in Environmental Science. As an alumni of the Southface Emerging Leaders program, Andrew has contributed to green building projects across the country. He worked as a Sustainability Analyst at Gables Residential before joining SK Collaborative.

Andrew has a deep commitment to the preservation of the natural world stemming from his experiences as an Eagle Scout. On the weekends you’ll likely find him hiking in the north Georgia mountains or walking his dog, Mabel. He’s also an avid baseball fan (Go Braves!)

Jennifer Goldberg

Green Building Project Manager

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Jennifer graduated from Georgia Tech with a bachelor’s degree in Civil Engineering. She has worked as an intern in LEED consulting, which led her to pursue the field of sustainable construction in the hopes that her work will improve whatever corner of the world it inhabits. In her spare time, Jennifer enjoys tap dancing, photography, and all manner of art projects.

Sarah Kelty

Marketing Manager & Green Building Project Manager

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Sarah is a creative and dynamic professional with over a decade of experience in program development, community engagement, and outcome management. She holds an MSP from Florida State University’s Department of Urban & Regional Planning, with a specialization in Environmental Planning. 

Prior to joining the SK team, Sarah spent two years managing disaster mitigation and resilience projects and state/federal grant programs in the Southeast. Past experience also included serving as a Mayoral Fellow at the Tallahassee-Leon County Planning, Land Management & Community Enhancement (PLACE) Division in Tallahassee, FL and as Community Engagement Coordinator at YouthBuild Louisville – a nonprofit organization that empowers young people with construction skills through building affordable housing.


When she’s not at work, you can find Sarah exploring Georgia’s outdoor recreation areas or getting her hands dirty in the garden. Prior to moving to Georgia, she lived in Florida, Kentucky, Puerto Rico, and Texas.

Abe Kruger


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Abe Kruger, SK Collaborative cofounder, honed his expertise in sustainable construction over the last 17 years as a contractor, educator, and consultant in the residential construction industry. He has numerous industry accreditations, including Certified Energy Manager (CEM), LEED AP HOMES, BPI Building Analyst, and Home Energy Rating System (HERS) Trainer, Quality Assurance Designee (QAD), and Rater.

He is a member of the national Residential Energy Services Network (RESNET) Board of Directors and Georgia Healthy Homes Coalition Steering Committee. He is the coauthor of the first residential green building textbook, Green Building: Principles and Practices in Residential Construction (Delmar/Cengage Learning).

Deborah Lin Pérez

Single Family Program Manager

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Deborah Lin Pérez is an architectural designer and green building professional dedicated to affordable housing and sustainability. Previously, she served as an Enterprise Architectural Rose Fellow at Atlanta Habitat for Humanity, where she led Community Engagement and Participatory Design initiatives for a new mixed-use development and designed new Model Homes. During her tenure with the Puerto Rico Housing Finance Authority, Deborah managed the development of numerous single family homes and worked with HOME Grants and Tax Credits to finance multifamily affordable housing. As a Fair Housing and Accessible Design Specialist she also coordinated accessibility retrofits of existing multifamily buildings.
Deborah is invested in creating better affordable environmentally sustainable communities where people of all income levels can live, work and recreate, with high quality design at the home and neighborhood scale.

Deborah has a Bachelor in Fine Arts and Master Degree in Architecture from the University of Puerto Rico. Deborah also enjoys oil painting and drawing.

Jennifer Marchesi

Director Of Business Development

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Jennifer Marchesi brings over 23 years of experience in the construction, architectural, and engineering industries. She has a B.A in Physics from Oglethorpe University and an MBA from Purdue University. She is an expert in communications, and most recently worked for a building enclosure consulting firm where she assisted in preparing construction litigation cases.

Carl Seville


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Carl Seville has over 30 years of experience in renovation and home construction.  He owned and operated SawHorse, Inc, one of the largest design/build renovation firms in Atlanta for over 25 years.

Carl is a Green Globes professional, a HERS rater, an NGBS Master Verifier, a LEED Green Rater, and an EarthCraft and Enterprise Green Communities Technical Advisor, and holds the LEED AP Homes designation.  He has served on the boards of directors of the Greater Atlanta Homebuilders Association and the Atlanta chapter of NARI, the Green Building Subcommittee and the Green Building Education Curriculum Committee of NAHB, NARI’s Green Remodeling Education Committee, the Georgia Governor’s Energy Policy Council, the USGBC Residential Green Building Advocate for Atlanta, and as a member of the board of the Atlanta Branch of the USGBC.


He has contributed to Multifamily Executive, Remodeling Professional Remodeler, Builder, Home Energy, and numerous other trade and consumer publications.  He is a contributing editor for GreenBuildingAdvisor.com, and is a co-author of Green Building, Principles and Practices in Residential Construction, the first college textbook on residential green building, the USGBC/ASID ReGreen residential green remodeling guidelines and the LEED for Homes Reference Guide.


He is a graduate of the Rhode Island School of Design (RISD) where he studied architecture, fine arts, and design.