San Francisco, California 94111
Monday – Friday, 8:00am – 5:00pm
+1 415 828 1451

Meet The Team

Conservators, Construction Managers, and Architects.

All under the same roof.

David P. Wessel, AIC, FAPT


David is the CEO of ARG/CS and a trained architectural conservator with more than 25 years' experience in the conservation of cultural resources. David directs ARG/CS' conservation projects and is responsible for developing specialized treatments for stabilization, repair, and restoration of cultural property.

Glenn David Mathews


Glenn David is the COO of ARG/CS and is licensed architect with over 40 years' experience in the fields of architecture and construction. He has over 30 years' experience specializing in renovation, restoration, and preservation of historic properties. Glenn David is also a licensed general contractor with a strong background in specifications writing, construction management, and materials conservation.

Trevor Smith

Project Manager, Estimator

Trevor spent his youth and early career restoring historic homes with his father's family business. Much of his career since then has been spent coordinating large-scale commercial and heavy-civil construction projects. Trevor has over 18 years of experience in managing a wide array of construction trades and disciplines.

Marshall White


Marshall owned and operated his own residential contracting firm for 31 years. He brings that experience to ARG/CS in his role as one of its on-site superintendents to coordinate, manage, and problem-solve issues associated with complex construction and preservation projects. Marshall is also a master carpenter who performs finish carpentry work and hands-on rehabilitations of historic windows.

Daniel Webb


Dan has 42 year’s experience in high-rise construction, also serving as an inspector of cranes and aerial equipment for façade workers. In addition, he consults on vertical safety operations of high work and performs rope access work in difficult and seemingly impossible locations. Dan teaches technical rope rescue and serves as a volunteer search and rescue officer.

Johana Moreno

Senior Conservator

Johana is a fine arts conservator with over 17 years' experience working for art and archaeological museums and galleries, in addition to teaching at the university level in Colombia. She is a graduate of the Cultural Heritage Studies Program (Museology, Archaeology, and Restoration) at the Universidad Externado de Colombia. Johana specializes in assessment, and has developed and performed conservation treatments for a wide variety of modern and contemporary art pieces and archaeological and ethnographic artifacts.

Dena Kefallinos

Project Manager, Conservator

Dena has a B.A. in both History and Art History from UC San Diego, an M.S. in Historic Preservation from Columbia University, and a Certificate in Project Management from UC Berkeley Extension. She has five years experience performing hands-on work on historic buildings, monuments, and artwork. Dena also performs building and artwork surveys, cleaning tests, paint analysis of historic finishes, and drafts drawings and specifications.

Megan Carver

Project Manager, Conservator

Megan has 7 years of experience in construction administration, historic structure and artwork surveys, and hands-on implementation of sensitive conservation repair techniques. She received her BSBA in Real Estate and Construction Management from the University of Denver, and an Advanced Certificate in Historic Preservation and Restoration Technologies from College of the Redwoods. Megan's expertise is in the conservation of interior and exterior architectural elements including wood, masonry, plaster, glass, and metals.

Mitzi Mathews

Assistant Project Manager

Mitzi worked in fine arts museums prior to joining ARG/CS in 2016. Her experience in operations management makes her a key asset in the coordination of construction and conservation projects. Mitzi holds an undergraduate degrees in Art History with an emphasis on Historical Architecture from UC Davis, and a MBA from John F. Kennedy University.

Joan Boas


Sadaf Shafer

Human Resources Administrator, Bookkeeper

Scott Hahn

Marketing Coordinator