Our Team

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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.

Meet The Team


Abe Kruger


Abe Kruger, SK Collaborative cofounder, honed his expertise in sustainable construction over the last 15 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.

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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).


Carl Seville


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.

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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.


Sarah Kelty

Sales & Marketing Associate/Green Building Consultant

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. 

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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 low-income 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.


Joe Baumann

Multifamily Program Manager

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.

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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.


Samantha Morton

Single Family Program Manager

Sam joins SK Collaborative after working as an Environmental Scientist performing site assessments of commercial properties and as a Commercial Sustainability Services Fellow at Southface. She graduated from the University of Georgia with a Bachelor of Environmental Sciences degree.

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Sam manages all inspection and certification services for our single family projects and assists with light commercial certification, working with EarthCraft, National Green Building Standard (NGBS), and LEED for Homes. She is a RESNET certified HERS rater, a LEED Green Associate, an EarthCraft Technical Advisor, and an NGBS Green Verifier.


Diana Sacks

Green Building Project Manager

Diana Sacks recently earned a bachelors in environmental engineering from The Georgia Institute of Technology where she participated in several projects studying the effects of wood burning stoves on ambient air quality in rural Nicaragua. She is deeply in love with all things outdoors and her wild dog, Fern.


Andrew Doetsch

Green Building Consultant

Andrew is a native Atlantan who 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 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!)


Carlos Corrales

Green Building Consultant

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.

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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.