Paul DiDonatoPaul DiDonato

Paul DiDonato, AIA

CEO/President What I love most about my profession is that every day brings a new opportunity, a new project, a new teammate, a new client to collaborate and a welcomed new challenge. My passion is building a professional/workplace family of bright, experienced, and ambitious teammates with diverse strengths to solve problems, that to others seem to be too challenging to face. That passion is applied through ATI as we are comprised of the best of the best and talented individuals that are dedicated to our clients, as we design, create, and reimagine their environments for generations to come.

Mr. DiDonato has over 35 years of experience in the architectural/engineering consulting industry. Mr. DiDonato is a founding Principal and President of ATI and serves as Proj­ect Manager on larger multi-discipline projects. He has led the development of ATI’s K-12 business. In addition to ATI’s primary A/E business, Mr. DiDonato is eminently qualified in the areas of large industrial facilities design and operation as well as an expert in management.


Mark Bello, AIAMark Bello, AIA

Mark Bello, AIA

Managing Principal When I was young, an Architect neighbor tapped into my curiosity. I love discovering how things work, go together, simple or complex and I saw how thoughtful reflection and insightful design can dramatically alter how people interact with the environment. – Mark on why he got into Architecture

Mr. Bello has over 30 years of experience in architecture and for the past 19 years has been ATI’s primary K-12 Practice Leader. Mr. Bello was the Project Principal for the development of ATI’s Emily product line – a DSA approved series of prototypical designs that are adaptable by Districts, bid and built by General Contractors. Currently there are over 1000 classroom/classroom wings in design/construction at various School Districts throughout Califor­nia. In addition to being an expert in K-12 educational design, Mr. Bello has extensive experience with office, medical, food service, hotels, naval rehabilita­tion, custom and production housing projects.


Bruce GillingsBruce Gillings

Bruce Gillings, AIA

Managing Principal

Mr. Gillings has over 35 years of experience in architecture, including 25 years as the owner of his own architectural firm prior to joining ATI. Mr. Gillings’ experience throughout Southern California has been focused on industrial projects, with a strong history in: cold storage, food processing and bottling facilities. His work also includes: administrative offices, maintenance, logistics/warehousing/distribution and transportation facilities, and manufacturing.

G. Michael GoldsworthyG. Michael Goldsworthy

G. Michael Goldsworthy, R.A.

Managing Principal Work hard and figure out how to do it better.

Mr. Goldsworthy brings over 45 years of experience to the design of a wide range of solutions to contemporary environmental design problems. He has worked as designer, project architect, project field representative, and/or project manager on a great number of industrial, hospitality, retail, and other commercial projects, religious, residential, urban, and civic projects with in-place construction costs of over $900 million.

Phillip CairesPhillip Caires

Phillip Caires

Principal, Special Projects What I learned from my first supervisor at age 18 is as true today as it was then – talk slow and walk fast.

Mr. Caires has over 25 years of project management and research related experience encompassing both the public and private market sectors. At present he is the supervising Principal-in-Charge for blanket contracts with the Oak Grove, Pittsburg and Palo Alto School Districts as well as projects for the United States Postal Service.

Rachel HamiltonRachel Hamilton

Rachel Hamilton, AIA

Senior Associate, Principal Architect

Ms. Hamilton is a licensed architect with over 30 years of design, construction and project management. She has spent much of her career bringing new life to older residential and commercial buildings and designing new buildings to fit into established urban neighborhoods. Ms. Hamilton is experienced at designing in most of the styles, historic and contemporary, that are found in the Bay Area. Beyond extensive design and construction experience, she has a solid grounding in structural engineering and urban planning. She takes great pride in her ability to craft innovative solutions to complex problems and to work with clients, consultants, city agencies, all building trades, as well as members of the community at large.

Rup ChandRup Chand

Rup Chand, R.A.

Principal Architect

Mr. Rup Chand has 20 years of experience as Architect, Designer and Project Manager on a multitude of projects of varied scope, size and complexity. He has a solid technical background and has been involved in project management, design and construction documents. Mr. Chand is a licensed Architect in the State of California.

Deborah LesnefskaDeborah Lesnefska

Deborah Lesnefska

Principal It’s the perfect blend of math and art! - Deborah Lesnefska on what she loves most about architecture.

Ms. Lesnefska has 18 years of experience in Civic, Educational, Public and Commercial projects. She holds a Bachelor’s Degree in Architecture from Cal Poly San Luis Obispo and a Master’s Degree in Architecture with a specialization in Design and Energy Conservation from the University of Arizona. Her Master’s thesis, Sustainable Architecture as Environmental Education (SAEE): Developing an Integrative K-12 Curriculum, focused on K-12 schools with an emphasis on sustainable design as an opportunity for environmental education.

Anna WinAnna Win

Anna Win, AIA, LEED AP

Principal No matter the design, construction, or budget challenges along the way, architecture always brings a measure of delight for someone at the end of the day.

Ms. Win is a licensed architect with over 20 years of design, construction and project management experience in office interiors, mixed-use commercial / retail, higher education, and institutional projects. She has excellent organization and communication skills in building team rapport on her projects. She creates environments that are responsive to clients’ aesthetics, functional, operational, and financial goals.


Robert RiegelRobert Riegel

Robert Riegel, S.E., R.A., LEED AP

Associate, Principal Structural Engineer Great design happens when an Engineer thinks like and Architect and an Architect understands Engineering.

Mr. Riegel is a Licensed Structural Engineer and Architect with 35 years of experience. Mr. Riegel has extensive experience with airport-related projects and seismic retrofitting. His capabilities include interdisciplinary coordination checking, energy conservation, and construction phasing.

Jim PanJim Pan


Senior Associate, Principal Architect

Mr. Pan is a well-respected and experienced Senior Project Manager. His exceptional skills include all aspects of proven architecture design, engineering, and construction. As the Senior Project Manager, he is responsible for all project coordination as well as client management. Mr. Pan has extensive experience in mixed-use, multi-family, commercial, industrial, government and military projects. Additionally, Mr. Pan has served as the Architect of Record for numerous noteworthy K12 and community college projects during his professional career. Mr. Pan takes pride in providing quality service to his clients with innovative designs while ensuring a strict adherence to budget and schedule.

Emad HamdyEmad Hamdy

Emad Hamdy, R.A.

Principal Architect

Mr. Hamdy has over 30 years of architecture expertise. His expertise includes an extensive list of school projects as well as healthcare and medical facilities. His recent accomplishments include new campus designs for a K-8 elementary school and a new career tech high school for the San Bernardino City Unified School District. Both campuses are Hardship Funded Project that would have lost funding were it not for the speed in which the designs were taken through DSA. Mr. Hamdy specializes in the holistic approach to campus design, constructability review, and systems coordination.

Wing LauWing Lau

Wing Lau, P.E., CEng, FIET

Associate, Principal Electrical Engineer Life is limited. Innovation is not.

Mr. Lau has over 25 years of experience in design, construction, planning, project management, and utility business asset management. His excellent analytical skills allow him to identify critical items and problems in early stages of a project, while staying on budget and schedule.

Kate LyleKate Lyle

Kate Lyle, R.A.

Senior Associate, Project Manager

While at ATI, Kate has been involved in the design and construction document production for a diverse range of industries, including government, cold storage, industrial and entertainment projects. Kate is responsible for project design, site planning, construction documents, specifications, and construction administration.

Randy ZumwaltRandy Zumwalt

Randy Zumwalt, CEM, LEED AP

Mechanical & Utilities Infrastructure Project Manager

Mr. Zumwalt has over 30 years of experience developing facility retrofit projects throughout California. Clients include UCSF, John Muir Medical Center, Washington Hospital, Tenet Hos­pitals (San Ramon Regional, Redding Medical, and JFK Memorial) Lucile Packard Children’s Hospital, Stanford Medical Center, Kaiser Redwood City, and Catholic Healthcare West Facili­ties. Mr. Zumwalt’s Prime Mechanical, Electrical, and Plumbing (MEP) Consulting experi­ence involves developing the scope of work, phasing requirements and technically complex engineering solutions for Infrastructure upgrade projects mostly in the built environment. In the 1980’s Mr. Zumwalt was a statewide prime design-build contractor responsible for turn­key solutions that included OSHPD permitting. He has extensive background in upgrading critical 24/7 air handling units to meet Table 4A system requirement with minimal shutdown periods.

Daniel SchweickertDaniel Schweickert

Daniel Schweickert

Principal, Director of Business Operations

Mr. Schweickert provides managerial expertise and oversight of the work flow processes that assure all financial, quality, and efficiency goals are met in every aspect of the company operations. Mr. Schweickert plays a key role in the decision-making process and goal setting activities. In this capacity, he provides support with strategy and implementation to ensure that the vision of the company is upheld.

Mr. Schweickert earned a BA in Mathematics from UC San Diego, and has a MBA and MS in Engineering Management from California Polytechnic State University-San Luis Obispo.

Dale FurmanDale Furman

Dale Furman, AIA, LEED AP

Project Manager

Dale has over 30 years of experience in the architecture industry and is a Licensed Architect. He is an expert in transforming schematic design drawings into high quality Construction Documents. He will work closely with our clients to define project scopes and create designs that exceed client expectations.

Rick HallenbeckRick Hallenbeck

Rick Hallenbeck, AIA

Associate, Project Manager Architecture is my life passion and part of my soul as dancing is for a dancer or singing is to a singer.

Mr. Hallenbeck is a licensed Architect in California and Arizona with over 20 years of experience, specializing in New & Existing Construction of various project types including: Industrial, Food Processing, Manufacturing and Restaurant Projects. His Project Management experience includes all phases of architecture, including design development, construction documents, project management, and construction administration.

May MohamedMay Mohamed

May Mohamed, R.A.

Architect Architecture is an adventure in space making. I am inspired with every new project to help clients imagine and create vibrant spaces where they can work, learn, and thrive.

May has over 15 years of professional experience on a broad range of architectural building types, and in all phases of project delivery. Recent project experience has been in educational projects, where she has successfully spearheaded and integrated CHPS criteria into multiple school sites. In her role as the Project Architect, May will work with Rachel to ensure that all of the County’s projects are cared for with utmost quality.


Rick ColemanRick Coleman

Rick Coleman, R.A., NCARB

Project Executive/Architect

Rick has over 43 years of experience in the field of architecture. He has extensive experience in entertainment facilities, and nationwide and worldwide experience in education, hospitality, food service, government, health care, entertainment, industrial and retail marketplaces.

Alla HesseAlla Hesse

Alla Hesse

Marketing Manager There is so much beauty we ignore because we are too caught up in our world and all it takes is someone to bring it into light with a creative twist in order for it to be rediscovered. Alla Hesse on why she got into Marketing

As a Marketing Manager, Ms. Hesse’s primary function is to ensure that all marketing and business development activities upholds to ATI’s strategic vision. Her responsibilities include developing and executing all marketing campaign, as well as producing Statement of Qualifications, Brochures, and Presentations. In her tenure with ATI, she has expanded a library of marketing collateral for various market sectors, as well as directed the re-design of ATI’s website and the creation of EmilyTM’s new website, EmilyReuseDesign.com.

Lindsay HemstalkLindsay Hemstalk

Lindsay Hemstalk

Finance and Project Administration Manager I love that every day there is a new challenge – a problem to solve, a new way I have to look at things to get to a resolution.

Ms. Hemstalk has grown her career at ATI in the accounting department since 2006. She has been leading the department and providing human resources supervision for the last 3 years. Her primary responsibilities include the overall supervision of the accounting department and supporting the management team with various financial reporting functions. Ms. Hemstalk’s additional responsibilities include managing all functions related to accounts receivable and payable, contract review, financial reporting, and human resource supervision.  Ms. Hemstalk is intricately involved in the analysis and improvement of internal accounting processes, and has implemented several paperless procedures to reduce ATI’s impact on the environment.

Contact Us

Please send us an email and we'll get back to you, asap.

Not readable? Change text. captcha txt