Key Employees

COMPANY OWNERS

Jack Halperin

Jack Halperin, Owner and Project Manager

A second-generation contractor, Jack has worked in all aspects of construction. He started over ten years ago with hands on carpentry experience and has since worked in all levels, from building fences and decks to managing complex occupied rehab projects. He has held multiple positions with D&H, starting in carpentry, moving to site superintendent, then on to project manager, and is currently one of the company owners. As project manager at D&H, he provides coordination between the project owner and field personnel to ensure that the owner's needs are met, develops and implements project documents, works closely with architects, construction managers, subcontractors, and superintendents, creates complex schedules, ensures excellent quality control and site safety, and maintains clear communication among diverse stakeholders. He is also involved in new project planning for D&H, including drawing review, subcontractor selection, bid proposals, and budget development. Jack believes in sustainability through good construction practices and job-site awareness.
Jansen Lum

Jansen Lum, Owner and Project Manager

Jansen, a native from the East Bay, is a licensed architect and contractor that has been involved in design and construction management in the Bay Area for over two decades. He has a Bachelor of Architecture with a minor in Art History from California State Polytechnic University Pomona. He has a background in construction management with on site management experience. His prior position specialized in construction of multi-family housing, but has experience in commercial, retail, health care, institutions, and single-family. Jansen brings a unique perspective to the office having been a design professional as well as a construction project manager.
Marshall Snow

Marshall Snow, Owner and Project Manager

As a fourth-generation contractor, Marshall has been involved in numerous aspects of the construction industry for most of his life. He has worked on various project types ranging from historic restoration, new custom homes, and affordable housing. Marshall graduated with a BS in Urban Studies from San Francisco State University, where his studies focused on land use planning, affordable housing, and green building. Professionally, he has worked for nonprofit developers, community development groups, and city planning departments focusing on sustainable development, planning, and policies at the local and regional levels. Marshall is responsible for estimating, scheduling, and overseeing projects through completion.


PROJECT MANAGERS

Jim Bourque

Jim Bourque, Project Manager

Jim has extensive and diverse project management experience in multiple areas including retirement housing, high-rise structural retrofits, public schools, colleges, community centers, and hazardous abatement. He is a highly effective team leader with a proven ability to successfully manage and deliver multi-million dollar projects that have exceeded customer expectations, on-time and on-budget. Jim is very organized, professional and able to manage multiple complex projects simultaneously. His project manager duties include plan review, preparing pricing sheets, developing preliminary budget estimates for new projects, scheduling, and ensuring excellent quality control. Jim loves to travel and he also enjoys scuba diving and ice hockey in his spare time.
Oskar Contreras

Oskar Contreras, Project Manager

With over twenty years of experience, Oskar has been involved in all aspects of construction — construction laborer, draftsman, project engineer, project manager, and estimator. Previous work has included cost engineering, CAD, project scheduling, project control activities, contractor bid reviews, and productivity analysis. As Project Manager at D&H, Oskar is the primary point of contact with the owner and architect, and he works directly with the job site superintendent in scheduling and coordinating employees, subcontractors, and vendors, and managing the project budget. Oskar is fluent in English and Spanish. He's a licensed amateur radio operator and IT enthusiast.
Richard Orlando

Richard Orlando, Project Manager

With an educational background in construction engineering management and years of professional experience, Richard brings wide-ranging knowledge of construction principles, techniques, and procedures to D&H. Past projects include schools, health care facilities, commercial space, and residential units. As project manager, Richard provides detailed estimating, manages the overall project schedule, supervises the on-site team, oversees contract documentation – including RFIs, submittals, prime contract change orders, subcontract change orders, correspondence, permits, and reports – conducts the weekly construction meetings, and is the primary point of contact for the owner, architect, and consultant.


FIELD PERSONNEL

Chris Chreston

Chris Chreston, Superintendent

With 11 years in the construction industry, Chris has worked in a commercial building environment and at the University of California where he learned his craft as a carpenter, foreman carpenter, assistant superintendent, and obtained a General Contractor license. At D&H Construction as a site superintendent, he manages all aspects of the jobs, including scheduling, coordinating subcontractors, communication with building managers and personnel, problem solving, quality control, safety meetings and safety enforcement, and task management. In his spare time Chris plays guitar, works on his 1969 Plymouth Barracuda and is an outdoorsmen.
Jason Hughes

Jason Hughes, Assistant Superintendent

Coming from a carpentry background, Jason has been working with D&H Construction since 2018. As assistant superintendent, his duties include assisting project management in developing and implementing project procedures. He supervises craft employees and other contractors working on the job, assuming the responsibility for the productivity of crafts, the efficient use of materials and equipment, and contractual performance of the project.
David Lock

David Lock, Assistant Superintendent

David has been involved in construction since 2013. He has held various positions, including carpenter/foreman – where he was responsible for delegating tasks for a three-man crew, scheduling subcontractors, ensuring safety compliance, and maintaining job records – and also as metal fabricator at a metal shop. His duties at D&H involve planning, coordinating, and supervision of on-site and off-site functions, including scheduling, engineering, material control, providing day-to-day direction of administrative staff, supervising craft employees, and providing technical assistance for interpretation of drawings, recommending construction methods and equipment.
Scott Mattson

Scott Mattson, Superintendent

Scott has been involved in all phases of construction for over 35 years. With expertise in excavation and grading, underground utilities, shoring, structural steel, concrete, and wood framing, he has a good understanding and working knowledge of all sub-trade plans, specifications, scheduling, and management. He has worked in all areas of the construction team, including carpentry, foreman, superintendent, estimator, and project manager on commercial, residential, government, and health care projects. As superintendent at D&H, Scott is responsible for interacting with the architect, site manager, subcontractors, and inspectors, and managing the day-to-day flow of information between the job site and D&H office.
Alvin Saechao

Alvin Saechao, Project Engineer

Alvin has been working in the construction industry since 2013, including tile production, construction apprentice for a general contractor, and estimating/project management for a mechanical contractor. Bilingual in English and Mienh, he brings excellent communication, managerial, analytical, and organization skills to D&H, where he is responsible for assisting project management and the site superintendent in coordinating the documentation required for all phases of the project – preconstruction, construction, and closeout. Daily duties include processing RFIs, change orders, and submittals, in addition to assisting with coordinating on-site subcontractors, maintaining construction documentation, and assisting the project team to ensure construction work complies with contract requirements and meets the project schedule.
Greg Saler

Greg Saler, Superintendent

A site superintendent with thirty years of professional and practical experience in construction, Greg has an exceptional record of dependability and reliability with outstanding skills for scheduling and overseeing multiple subcontractors to ensure projects are completed on time and within budget. Past work has included everything from small residential remodels, large custom homes, and commercial projects, to work at sixteen locations on the UC Berkeley campus and large rehabs of occupied multi-family housing projects. As site superintendent at D&H he is responsible for all aspects of the project, including interaction with the architect, site manager, owner, and subcontractors, and coordination of all tasks that occur in occupied housing.
Chris Scallin

Chris Scallin, Superintendent

Chris Scallin is a project superintendent with over ten years of experience overseeing multi-family/senior housing projects. Chris has been involved with many different projects ranging from new/ground-up construction, to overseeing a major rehabilitation of a 300+ unit facility for senior housing, a gymnasium conversion — including installation of a drop down movie projector, rock climbing wall, and other recreational sports. Chris has also completed several smaller "matrix"/occupied rehab projects throughout the greater San Francisco Bay Area. Chris's primary responsibility at D&H Construction is to oversee day-to-day site activities, communicate and maintain project schedule, plans and specs, monitor site safety, and maintain owner and tenant relations.
Giovany Silva

Giovany Silva, Project Engineer

Giovany has been involved in construction for nineteen years in the fields of sheet metal, framing, and HVAC balancing and testing. Giovany graduated with a BS in Architecture from the University of California, at Berkeley in 2013, and obtained his Master of Science degree in Construction Management from California State University, East Bay in June, 2015. As LEED GA Certified, Giovany provides basic knowledge and understanding of green design. Giovany's primary responsibility at D&H Construction is to assist the superintendent in the field. He is involved in all project areas including subcontractor coordination, scheduling, construction safety and monitoring, and facilities communication between owner, architect, and subcontractors.
Scott Troop

Scott Troop, Superintendent

A California native, Scott has been working on construction in the Bay Area for twenty years, beginning with carpentry work at high end homes in the Napa Valley. His experience includes both new construction and modernization, where he worked as carpenter, foreman, assistant superintendent, closeout superintendent, and general contractor. His background is diverse, including work on school classrooms, cafeterias, gymnasiums, libraries, and administration offices, plus townhouses and single-family homes. At D&H he is involved in all project areas including subcontractor coordination, scheduling, construction safety and monitoring, and facilitating communication between the owner, architect, and subcontractors.
Cody Woolley

Cody Woolley, Assistant Superintendent

Cody has been working in the construction industry since 2012, working as carpenter and foreman on residential and commercial projects. His experience includes carpentry, plumbing, electrical, framing, tile, painting, and all finish work. As assistant superintendent, Cody is responsible for subcontractor coordination and the organization, distribution, and management of construction documents for the field office. With a background in diverse construction trades and problem solving, planning, and organizing abilities, Cody is well suited to the varied job responsibilities for this position.


OFFICE ADMINISTRATION

Cathy Lenfestey

Cathy Lenfestey, Office Administration and HR Manager

A member of the D&H team for twenty years, Cathy is the senior staff administrator for D&H Construction. She has worked on all aspects of office administration, including billing, accounts receivable/payable, construction administration, pay applications, and contracts. As a long-term employee of the company, she currently prepares new project applications and bid proposals, oversees accounts payable processing, prepares subcontractor contracts, tracks prevailing wage compliance, processes payroll, ensures D&H insurance compliance, and manages the website. Her experience working in the public sector for over thirty years also gives her expertise in the technical operations and requirements for D&H.
Tina Silveira

Tina Silveira, Accounts Payable

Tina heads the accounts payable division at D&H. In addition to processing all monthly and subcontractor invoices, she oversees contract compliance issues, manages telecommunications services, and maintains and tracks company credit accounts. Past positions include the accounts payable lead at a San Francisco construction company and calculating and processing complicated retirement plans as an independent contractor for an investments firm.

Tina is bilingual (English and Urdu), holds an Associate of Applied Business in Accounting and a BA of Commerce in Accounting degree, and is an expert soccer player who played on the state team for the national Pakistan soccer tournament in 2007.
Margaritha Tahan

Margaritha Tahan, Project Administration

Margaritha has been working in the construction industry for over twenty years. Past positions have given her skills in all aspects of construction administration, including insurance compliance, contract compliance, preparing submittals, change orders, RFIs, proposals, bids, marketing and sales, and monthly meeting coordination. Margaritha is responsible for reviewing and analyzing owner/GC insurance requirements, tracking subcontractor insurance compliance, processing submittals, RFI preparation, subcontractor bid invitations, processing owner and subcontractor change orders, and compiling close out documents. She is fluent in German and English and is a proponent of affordable housing, believing that is a basic right for everyone.
Alice Wilson-Abramson

Alice Wilson-Abramson, Contract Accounting and Administration

Alice has worked in the construction industry for 15 years. She worked as an accounts receivable/payable professional with a San Francisco firm where she handled all aspects of accounting. Alice brings exceptional organization and complex problem solving skills to D&H Construction where she oversees contract requirements, budgets, and documentation.