720-598-0774 info@rja-eng.com

Meet Our Engineering Team


Who We Are.

Founded in 2009, Ramirez, Johnson, and Associates was formed on the principles of providing engineering solutions with a customized approach that delivers the best value for every project. As a small firm, we can give each client and project the personal attention deserved. Licensed in Colorado and 13 other states, our engineers, commissioning agents, and designers are ready to take on projects ranging from $1,000 to $100,000,000, including commercial spaces, healthcare facilities, educational facilities, multi-family and high-end custom residential projects. RJA is M/WBE, DBE, SBE, EBE Certified.


Our Partners.

Darin Ramirez, PE

Darin Ramirez, PE

Founding Partner

As a founding principal of RJA, Darin provides over 17 years of experience in the design, construction, and consulting industry.  He is involved in all aspects of the firm’s daily operations.  As designer, Darin’s passions include collaborating with owners and users to truly understand their needs, and providing design solutions that are efficient and appropriate for each clients.  Off the clock, Darin can usually be found chasing his kids, climbing, and skiing in the Rocky Mountains.

Education:
Bachelor of Science, Mechanical Engineering, University of Florida

Affiliations and Registrations:
Professional Engineer:  CO, NC, OK, OR, TX, WA, WY, & UT

Certified Geoexchange Designer

LEED AP

Eric Johnson, CxA

Eric Johnson, CxA

Founding Partner

Eric’s passion for buildings and sustainable design directs the work of the firm and his construction and contracting background provides a practical perspective on each project. With over 19 years of experience, Eric is involved in either a design or commissioning role on every project and excels at leading talented engineers and designers towards solutions that are in the best interest of the client and the project. As a strong community supporter, Eric’s volunteerism through Junior Achievement helps to provide a positive and lasting impact on young people’s economic and entrepreneurship skills, career choices, and success.  During his free time, Eric enjoys skiing, hiking, golfing, and spending time with his family.

Education:
Bachelor of Science, Architectural Engineering, University of Colorado

Affiliations and Registrations:
LEED AP

Certified Commissioning Authority, CxA


Our Engineers.

Paul Plewczynski

Paul Plewczynski

Electrical Engineer

Paul is an electrical engineer with 13 years of engineering experience in the Denver area. His background includes roles on the owners’ team as well as on the consulting side of the industry.  Paul is responsible for spearheading RJA’s Revit/BIM collaboration with our clients, and he specializes in new and existing projects that require creative power distribution design.

Paul enjoys hiking, backpacking, and mountain biking with his wife and three kids.

Education:
Bachelor of Science, Electrical Engineering Technology, MSU Denver
Associates Degree, Computer Aided Drafting, ITT Technical Institute

Affiliations and Registrations:
ICT Design Fundamentals

Scott Zimmerman, PE

Scott Zimmerman, PE

Mechanical Engineer

Scott is a mechanical engineer with experience in the commercial and industrial sectors. Since 2010, his varied project background includes telescope observatories, college sports facilities, mineral processing plants, commercial kitchens, and breweries/distilleries. Scott is well versed in the BIM/VDC design process and is a proponent of 3D modeling software.

In his free time, Scott enjoys fourwheeling and exploring Colorado’s backcountry.

Education:
Bachelor of Science, Mechanical Engineering, University of Arizona

Affiliations and Registrations:
Professional Engineer: AZ, CO, IA, ID, and UT
Member ASHRAE, former Chapter President
LEED Green Associate

Judah Katz

Judah Katz

Mechanical Engineer

Judah is a talented and detail-oriented individual with 8 years of mechanical and plumbing design experience in the residential, commercial, and light industrial sectors. His project experiences are comprised of a diverse group of industries including educational facilities, restaurants/breweries/bars, retail spaces, institutional housing, and higher education.  Technically, Judah is adept in the use of multiple energy modeling, BIM, and design software.  Family, music, and finding ways to enjoy the sun are his choices when not in the office.

Education:
Bachelor of Science, Mechanical Engineering, University of Alabama

Affiliations and Registrations:
Member ASHRAE

Chris Wood

Chris Wood

Mechanical Engineer

Chris is a mechanical and plumbing engineer with 9 years of experience in multi-family and light commercial construction. He has engineered and managed projects from 350-unit multifamily buildings to small office tenant finishes. Chris moved to Denver from Western NY in 2009 after graduating from Alfred State College. In his off time Chris enjoys biking, hiking, and spending time with his dog.

Education: 

Bachelor of Science, Mechanical Engineering Technology, Alfred State College

Theresa Gray, PE

Theresa Gray, PE

Electrical Engineer

Working in the electrical and lighting design industry since 2001, Theresa’s passion for lighting design and efficient power systems has helped shape countless projects.  Theresa is licensed professional engineer and active member of the Illuminating Engineering Society of North America. 

Education:
Bachelor of Science, Architectural Engineering, University of Colorado, Boulder

Affiliations and Registrations:
Professional Engineer:  CO, WY, CT
IES
LEED AP

Cory Bondurant, PE

Cory Bondurant, PE

Mechanical Engineer

Cory earned a degree in Mechanical Engineering from the University of Kansas, and spent his early career designing systems across the Midwest from the Kansas City area. Cory brings diverse experience spanning industries such as health care, education, and commercial office spaces. In his spare time, he likes to hike, chase after his dog, read, and explore Denver.

Education:
Bachelor of Science, Mechanical Engineering, University of Kansas

Affiliations and Registrations:
Member ASHRAE

Nathaniel Morrison, EIT

Nathaniel Morrison, EIT

Electrical Engineer

Nate is a graduate from the Colorado School of Mines and is beginning his career at RJA. While in school, Nate learned commercial electrical design through his capstone project. In his free time he enjoys running, backpacking, and traveling. 

Education:
Bachelor of Science, Electrical Engineering, Colorado School of Mines

Nora Raine

Nora Raine

Mechanical Engineer

Nora’s background includes a degree in Mechanical Engineering from Iowa State University and experience designing mechanical systems in central Iowa. She relocated to Denver following after graduating to join the RJA team in 2021. She enjoys cooking, hiking, and skiing.

 

Education:
Bachelor of Science, Mechanical Engineer, Iowa State University

Zack Lange

Zack Lange

Electrical Engineer

Zack is an electrical engineer with specialized design experience in K-12 Education, where he brings unique perspectives to constructing classrooms and gathering spaces for the 21st century. Zack hails from the farms of Western Ohio where he graduated from Ohio State University. He moved to Colorado in 2016 to pursue his interest in skiing, camping, fourwheeling, and woodworking.

Education:
Bachelor of Science, Agricultural Engineering, Ohio State University

Emilie Wilson

Emilie Wilson

Office Manager

Emilie has managerial experience in different industries and likes to bring her skills of organization, communication, and collaboration to her teams. She moved to Colorado from Missouri after graduating college to broaden her horizons and meet new people. Emilie also enjoys skin care and practices esthetics when she’s not at the office. 

Education:
Bachelor of Science, Entrepreneurship, Missouri State University

Ryan Liberman, EIT

Ryan Liberman, EIT

Mechanical Engineer

Ryan joined RJA as a mechanical engineer in 2020. His background includes a degree in Engineering Physics from Tulane University and his technical background includes designing HVAC systems in the New Orleans area. His hobbies include snowboarding, Ultimate Frisbee, and Rocket League. 

Education:
Bachelor of Science, Engineering Physics, Tulane University

See What We’ve Been Working On

View some of the engineering projects our team has designed locally, in the state of Colorado, and across the country.  We’ve created solutions for commercial, retail, food service, multi-family housing, healthcare, renovation, hospitality, government, industrial, laboratory, and tenant finish projects.

Contact Our Denver Team

We consider projects of all sizes across the state of Colorado and beyond. Talk to our team to see if RJA is right for your next engineering project.

OUR CERTIFICATIONS

  • Professional Engineering
  • MBE, DBE, SBE, EBE
  • Member of the AABC Commissioning Group
  • CXA Certified Commissioning Agents
  • Certifiably Green Denver

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3295 Blake Street, Suite 104
Denver, CO 80205
e: info@rja-eng.com
p: 720.598.0774