Our Team

Floris Keverling Buisman

Chief Executive Officer

Floris is a renowned expert in building science, materials, high performance envelopes. He's been involved in NYC Building Code Committees, and numerous successful Passive House projects in NY and VT. He blends academic knowledge with practical experience as a LEED AP, Registered Architect in the Netherlands, and City College of New York adjunct professor. In 2001, he designed and built the Lucy House at the Rural Studio. Floris holds a dual Master's degree in Architecture and Real Estate Development from Delft Univ. of Technology. He cherishes time spent with his children- who he drops off at school on the back of his cargo bike. His unwavering commitment to find synergy between architecture and sustainability is what drives his effort to transform the building industry toward a low-carbon future.

Johnny Rezvani

Director of Communications

Johnny began a career in sustainability in 2009 when he became involved in co-authoring the first Climate Action Plan for The Evergreen State College, then developed regional sustainability plans in local government in the Pacific Northwest before joining 475. He holds degrees in Sustainability Planning from Evergreen and The City College of New York. Johnny now lives in Boulder, CO, where he loves to commute by bike and serves as President of Colorado Green Building Guild.

Matt Cull

Director of Finance

Matt graduated from NYU Tisch School of the Arts in 2005, then worked as a production accountant at ITV Studios and Vice Media where he became the head of accounting. He is also a critical home repair construction volunteer for Habitat for Humanity NYC and is a Certified Passive House Consultant. Matt is also a licensed small unmanned aircraft aerial system pilot and has flown over many 475 projects as well as shoots, edits, and produces 475 videos. Matt is an Ironman triathlete and a beer nerd.

Philip Miceli

Director of Operations

Phil comes to 475 with a B.S in Industrial Engineering from NY Institute of Technology and an M.B.A. from Hofstra University. After a successful career spanning engineering, consulting, banking, commercial real estate, sales, and marketing (online and offline), Phil decided to follow his passion for sustainability. He is a certified Passive House Consultant and a Certified Passive House Tradesperson. Phil loves to scuba dive with sharks, manta rays, and other large animals - diving all over the world from Fiji to the Caribbean, and Greece.

Aaron McCormack

Director of Technical Development

Aaron joined 475 in 2017 after working for our European partners, Ecological Building Systems in Ireland for 4 years. He holds a Bachelor of Science Degree in Architectural Design and Technology from Cardiff Metropolitan University. Aaron is a Certified Passive House Consultant and is trained in WUFI hygrothermal modeling. He manages our team of Product Consultants and engages in product development and testing. He stays connected to his homeland by watching Ireland play Rugby, Gaelic Football, and Hurling. In the office, he enjoys playing ping pong and supporting his favorite team, Aston Villa, over a nice IPA at his desk.

Ken Levenson


Ken has been a registered architect in New York State since 1993. He has a Bachelor of Architecture degree from Pratt Institute. Ken is a Certified Passive House Designer, and a founding board member of New York Passive House, the National Passive House Alliance, and the North American Passive House Network. Ken has served on advisory panels for Urban Green’s 90 by 50 advanced policy report and the Framework Guidelines for Energy Efficiency Standards in Buildings of the United Nations Economic Commission for Europe. When Ken isn’t thinking about Passive House, he can usually be found walking their 180 lb Newfoundland dog, Romeo, in Prospect Park.

Rachel Bernstein

Marketing Associate

Rachel's curiosity for both the built and natural environment was born out of growing up in New Orleans, Louisiana, where unique architecture and environmental issues are ever-present. Rachel graduated from Tulane University with a degree in Environmental Studies and minors in Architecture, Real Estate, and Urban Studies, and went on to complete her Masters of Science in Sustainability with a concentration in Architecture from the City College of New York. In her free time, Rachel enjoys hot yoga, hiking, film photography, and anything relating to dogs.

Trevor Cook

Product Manager - Lamilux Specialist

Trevor is a designer, fabricator, and manager based in NYC. He graduated from the University of Texas School of Architecture and studied woodworking under Matt Granick, a journeyman taught by Frank Klausz. Trevor became a Certified Passive House Designer in 2021 and joined 475 to apply his fabrication skills to a more sustainable industry. He loves chairs and their history, bike-packing, nice boots, and quality tools.

Brenden David

Product Consultant - West Canada

Brenden focused on Building Science and Restoration as a Project Engineer (P.Eng.) with prominent Building Envelope consulting firms. Driven to pursue higher performance and sustainable solutions, Brenden became a Passive House Designer (CPHD) providing Feasibility, Design, and Energy modeling services. Brenden has experience across Canada including the Lower Mainland, Prairie provinces, and GTA. He enjoys working through a good technical challenge and collaborating on constructable solutions.

Helena Deegan

Logistics Analyst

Helena took part in a semester abroad, while studying Human Resource Management, and found her love for logistics as she studied Logistics and Transport Management in Rotterdam for 9 months. After completing her undergrad, Helena went on to get her M.S. in Strategic Management at the Technological University Dublin. Helena is really interested in sustainable and creative projects, cooking, skiing and hanging out with friends.

Nina Kagan

Customer Service Representative

Nina is a recent graduate from Wesleyan University with majors in Architecture and History, and a minor in mechanical engineering. She gained a passion for sustainable construction while leading a design and build studio in undergrad, and a knack for woodworking while working in a fabrication studio. Nina enjoys building furniture in her spare time.

Akshayaa Kariyakkar

Product Consultant - Daylighting

Akshayaa graduated with a degree in architecture from SRM University before acquiring her Master of Science in Sustainability in the Urban Environment at City College. There she took interdisciplinary courses integrating engineering, architecture, and economics, and worked on a year-long research project to bridge the gap between food insecurity and food waste in NYC. In her spare time, she enjoys being creative through literary and artistic means.

Jeremy Latriano

Product Consultant - Daylighting

Jeremy joined 475 in 2017 while completing his Masters in Sustainability in the Urban Environment at CCNY. Starting as a Business Development Intern, Jeremy came on full time as an Operations Manager in 2018, before moving to his current role as a Product Consultant. In 2019, Jeremy finished his Masters and joined CCNY's staff as an Adjunct Lecturer, teaching the same Low Energy Buildings course that brought him to 475 originally.

Laura Martin

Accounting Associate

Laura started in the accounting industry almost two decades ago working for an accounting firm in Westchester, NY. She holds a Masters Degree in Accounting obtained from Wilmington University, College of Business and a Bachelor Degree in Economics with a Concentration in Forensic Financial Analysis, obtained from the City University of New York. For her, it's important to give back to her adopted city by volunteering for New York Care and riding to raise funds for Bike MS New York. Laura loves to travel and spend time with her dog, Jack.

Brad Moore

Product Consultant - New England

Brad got his start in construction during high school through vocational carpentry training before attending the University of New Hampshire where he graduated with a degree in construction management. Working for many years as a project manager for one of North America’s leading timber frame and panelized prefabricated construction companies brought out Brad’s passion for sustainable and responsible construction methods. Outside of work, he enjoys time with his family, golfing, and woodworking.

Mariana Moreira

Logistics Manager

Mariana is a Brazilian architect who worked with residential and commercial projects in São Paulo until moving to New York to pursue her passion for sustainability. She completed her Master’s of Science in Sustainability from the City College of New York and went on to get certified as a Passive House Designer. Mariana is fascinated by the role of buildings in a more sustainable environment and how they can contribute to its residents' health and life quality. In her free time, she likes to run, listen to classic rock, and learn new languages.

Corey Murphy

Product Consultant - NY State

Corey graduated from City College of New York with a Masters of Science degree in Sustainability in the Urban Environment in 2018. Corey spent much of his life between NYC and the Adirondacks, witnessing both extreme weather events and long-term ecological degradation related to fossil fuel use, he is passionate about promoting sustainability by design to achieve resilience in the natural and built environments. He spends his spare time as a Permaculture designer, focusing on Agro-Ecological engineering at his homestead, and enjoying the outdoors at every opportunity.

Ian Nimmo

Product Consultant - West

Ian has been with 475 since 2018 and loves supporting his clients with all thing's high performance! Most recently, Ian became a PHI certified Passive House Tradesperson in addition to his HERS Rater and BPI Building Analyst certifications. Ian’s father was a General Contractor in California for 35 years, so he has always had an interest in homebuilding. Ian has experience in canvassing, energy auditing, on site data gathering, data analysis, energy modeling, and blower door testing.

Gabrielle O'Grady

Product Consultant - CT, NYC, LI

Gabrielle is a CPHT and a LEED Green Associate. Her passion for craftsmanship began early as her parents and Austrian-trained cabinetmaker Opa built her family home in Wisconsin. Gabrielle received her B.S. in Physiology, Neurobiology, and Chemistry in 2011 and worked in the medical field in MA, NYC, and CO before returning for a M.S. in Sustainability in the Urban Environment with a focus on Architecture, to study building science, green building design, healthy materials, and how they relate to human health. Gabrielle worked for 3 years in retro-commissioning commercial buildings before joining the 475 team. She enjoys home improvement projects, green-building podcasts, snowboarding, sailing, and time with family.

Alexis Roberts

Systems Support Analyst

Alexis is from Austin, TX and graduated from CU Boulder with a degree in Information Science. While completing her Space minor, she used a weather balloon to study climate data on the edge of our atmosphere. She loves snowboarding Colorado’s world-famous slopes and attending outdoor concerts.

Nick Shaw

Senior Product Consultant – South, SE, Midwest & MidAtlantic

Nick got PHIUS Consultant and Builder certified in 2015. He’s worked as a builder and consultant for a variety of high performance projects. Regardless of  certification, he’s been focused on addressing operational and embodied carbon. With 10+ years of industry experience, he’s trying his darndest to help designers and builders make their projects more energy efficient and sustainable. During his free time, he rock climbs, hikes, and fights off his cats while renovating his home in Asheville, NC.

Ashley Verhines

Logistics Manager

Ashley graduated from the UCLA Institute of the Environment & Sustainability and holds certificates in Supply Chain Management from the Massachusetts Institute of Technology. Prior to working at 475, she managed public-private partnerships for a sustainable building nonprofit in NYC. In her free time, you can find her gardening or searching for the next best dumpling in Chinatown.

Aaron Waldt

Product Consultant - Eastern Canada (ON, QC, Maritime Provinces)

Aaron's experience in construction stems mostly from being on site. During his time working for a custom home builder in Collingwood, ON, he became fascinated with high performance building through spending his evenings taking courses at BCIT on sustainable design and passive house construction. Aaron is a certified passive house consultant and has degrees in biomedical engineering and business management. Keep an eye out for him at your local craft brewery or golf course.