The chapter’s Board of Directors, together with committee leaders and members, runs each chapter’s day-to-day activities.
President: David Markman
David Markman P.E. (CA) is a Senior Building Science Consultant with Morrison Hershfield’s San Francisco Bay Area office. He has enjoyed providing building science consulting on buildings ranging from single-family homes to iconic museums in his twelve-year career. David’s focus is working with clients, including Architects, Contractors, and Owners, to understand each project’s unique circumstances and design appropriate solutions.
Vice-President: Rob Worthing
Mr. Rob Worthing, RRC, has over 20 years of experience in the building enclosure consulting industry. He is a Senior Consultant at Allana Buick & Bers, Inc., with extensive knowledge of roofing and waterproofing systems. While his role on any given project varies, he generally performs a variety of services, including but not limited to: condition assessments of existing roofing and waterproofing systems, report development, design investigation with destructive testing protocols, preparation of design development (DDs) documents, and construction documents (CDs), peer review, bidding phase, development of addendum documents, construction administration and project closeout.
Mr. Worthing is an IIBEC Registered Roof Consultant and has a unique ability to apply a blend of technical knowledge, tangible field experience, and sound business judgment for each project to find the best solution for the Client.
Past President/Acting Secretary: Megan Cross-Wilkinson
Megan Cross-Wilkinson has 6 years of experience in the building science industry in existing buildings, new construction, and forensics/litigation. She currently works in the Oakland office at RDH Building Science Inc. and has managed projects in California, British Columbia, and Ontario, Canada. Megan holds a B.A.Sc. in Honours Environmental Engineering from the University of Waterloo in Canada. She is a member of the Association of Professional Engineers and Geoscientists in British Columbia and the California Board for Professional Engineers and Land Surveyors (PELS) in California.
Treasurer: Bill Gillette
Bill Gillette has been marketing and providing technical sales support for roofing and waterproofing systems over the past 25 years. Most recently relocating to the San Francisco Bay area in 2010.
Bill lives in Danville, CA, with his daughter, Isabella.
Director at Large – Industry: Eric Smith
Eric Smith works for Johns Manville in the Preferred Accounts group, typically servicing design professionals and building owners. He has been with JM for over 6 years and has been responsible for product development, sales, marketing, training programs, and the JM solar energy program.
Before working for JM, Eric worked as a manufacturing engineer and a design engineer and project manager in the solar energy sector. He holds a bachelor’s degree in mechanical engineering, a professional engineering license in the state of CA, and an RRO certification from IIBEC.
Director at Large – Consultant: Thomas Berger
Thomas (Tom) Berger has over 29 years of experience in the design and construction industry. He is the founding and Managing Principal for DTR Consulting Services. Before founding DTR in 2002, his experience ranged from an Architectural Project Manager, Construction Administrator/ Field Inspector, CM Program Manager, Carpenter, Facilities Planning Manager, Technical Specifier, Forensic Investigator, and Office Leader in various national architectural firms. Leading an expanding role in building science design & construction validation, he leads his firm in assisting design clients in selecting appropriate exterior skin walls, roof assemblies, and the almost forgotten area, the 6th side, below-grade assemblies.
Tom has received numerous professional certifications and awards and is part of numerous award-winning projects over the length of his career.
Director at Large – Consultant: Jonathan Stafford
Jonathan Stafford is a Senior Project Manager in the Building Technology Division of Simpson Gumpertz & Heger. Jonathan has 20 years of experience investigating and designing major commercial, institutional, and residential buildings for waterproofing issues, including roofs, plaza decks, and below-grade spaces. He consults with architects, contractors, and building owners in the design of the building envelope for new products and to analyze and repair water intrusion problems and construction defects for existing structures.
Jonathan is a licensed Professional Engineer in California and is an IIBEC Registered Roof Consultant.
Director at Large – Industry: Dave Johnson
Dave Johnson work as the Northern California District Manager for SOPREMA. Collaborating with consultants, contractors, and building owners. In his 6 years with SOPREMA, he has been responsible for sales, marketing, and contractor training.
Before joining SOPREMA, Dave worked as an architect after receiving his BS in Architecture from UW-Milwaukee.
Director at Large – Consultant: Sean LeCrone
Shawn LeCrone, RRO, REWO, CD, has 17 years of experience in the building envelope industry, consulting, assessment, contracting, project management, designing, and planning. He has enjoyed providing building science consulting primarily for Education type buildings (K-12 and Higher Ed) and ranging from large commercial, corporate, healthcare to Multi-Family. As Vice President of California, Shawn’s focus is to provide client service for all 8 offices of PBK, and their clients assist with the building envelope design of each project.
Director at Large – Consultant: Jerome L. Jeffers, II
Jerome Jeffers has over 40 years of experience in design services for the building industry. His building enclosure experience encompasses various project types, including educational, institutional, commercial, hospitality, and residential. Jerome is a recognized expert in roofing, waterproofing, and exterior wall consulting. Mr. Jeffers provides solutions to building weatherization issues and deterioration to building structures. Mr. Jeffers has earned the Registered Building Envelope Consultant registrations from IIBEC, the most prestigious certification for the roofing, waterproofing, and building envelope consultant practice.
Director at Large – Industry: Mark Swanson
Mark Swanson has over 15 years of experience in the construction industry. For nearly a decade, Mark held a variety of roles for a global waterproofing manufacturer, including Technical Services Coordinator and Technical Sales Manager for the Bay Area; Regional Manager of the Western US; and Regional Director for Europe, the Middle East, and Africa, based in London, England. In 2017, he founded CALBERS to find optimal building envelope solutions for the Bay Area, one of the most complex and high-risk waterproofing environments.
As President of CALBERS, Mark provides innovative solutions. Working with some of the most sophisticated Owners, Consultants, Contractors, and Architects, Mark has been intimately involved in some of the most challenging waterproofing projects worldwide.