About Us.

Mackenzie Collier Interiors is a full-service residential & commercial interior design team in the heart of downtown Phoenix, specializing in sustainable, functional design. 

Since 2011, our interior design team has serviced clients throughout Phoenix metro and beyond, completing projects in the Northwest, Midwest, and East Coast. MCI team members hail from around the country, and we apply our diverse experiences and perspectives to each client project. 
At Mackenzie Collier Interiors, we focus on working closely with clients to create personalized, stress-free design experiences, helping families and businesses express themselves through their unique spaces. We are committed to creating beautiful designs that not only look great but also support your lifestyle—taking our own tastes out of the equation and focusing on defining and developing your personal style. 

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Mackenzie Collier

Owner, Principal Designer
B.S. Psychology, Michigan State University
A.A.S. Interior Design, Harrington College of Design

Hometown: Cadillac, MI

Throughout her career, Mackenzie has gained a reputation for her unique approach to creating spaces that reflect her clients’ distinctive styles & interests. With a diverse portfolio of both residential and large-scale commercial projects, she has honed her skills in space planning and project management, placing emphasis on universal design practices and sustainability.

Prior to graduating with honors from Harrington College of Interior Design in downtown Chicago, Mackenzie earned her BS in Psychology from Michigan State University, where she focused on child and family psychology. The marriage of these educational backgrounds gives her the uniquely adept ability to communicate with clients and interpret their specific needs, and to understand the distinct ways individuals use their various spaces.

Mackenzie has built her business with her core values of community building, positivity and integrity in mind. She teaches and speaks nationally about business practices and interior design and is part of an ever-growing community of business owners who are expanding beyond the traditional business model.

Mackenzie constantly searches for new inspiration through travel, art, music, and nature. She loves highly functional spaces that have clean lines and natural light pouring in. She is a firm believer that the best design solutions are also the simplest and that kindness always comes back to you.

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Aleah Carr

Senior Interior Designer, Project Manager
B.S.D. Interior Design, Arizona State University

Hometown: El Paso, TX

Aleah worked her way to the top of the ranks of our team as Interior Designer and Project Manager, serving as the primary contact for clients and contractors and overseeing project details on over 150 residential and commercial projects since 2014. She has cultivated the ability to anticipate the needs of all parties from clients to contractors to vendors and orchestrate an organized and efficient project. With style, creativity and originality that is all her own, she's our go-to girl for out-of-the box ideas.

Aleah graduated from Arizona State University's Interior Design program, one of the nation’s most challenging, competitive and widely-respected CIDA accredited academic programs. Specializing in AutoCAD and SketchUp, Aleah brings a unique, tech-savvy form of concept development to the team. Outside the office, if she’s not stuck with her nose in a book, you can find her curating her collection of indoor plants or hanging out downtown.

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Yoselin Castro

Senior Interior Designer
A.A. Interior Design, Phoenix College
B.S. Interior Design, Northern Arizona University

Hometown: Phoenix, AZ

Yoselin may look young, but she is anything BUT inexperienced. She has earned her place as a Senior Interior Designer on our team with her exceptional design skills, attention to detail and ability to anticipate client’s needs and advocate for them even on the most challenging projects. Her professional experience ranges from high-end residential design to corporate offices, government buildings, retail spaces, restaurants, and senior living/memory care design projects.

Her expertise in AutoCAD, SketchUp, and the Adobe Suite allows her to use her tech-savvy skills to skillfully balance form, and function to help our team illustrate each client’s vision, and ensure they are thrilled. Yoselin is passionate about interior spaces and driven to enhance the way people live, work, and play in their everyday environments. She gains inspiration by exploring new places, as well as through her love for nature, art, and fashion. When she is not in the design studio, Yoselin likes spending time with her family, baking vegan recipes, and practicing yoga.

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Karleigh Handwork

Interior Designer
B.S. Interior Design, Art Institute of California, San Diego

Hometown: San Diego, CA

Karleigh has an incredible eye for mixing color and balancing form, which can be seen in the stunning design concepts she has created for our clients. She loves manipulating the elements of design to transform a space and allow it to highlight a client’s personality.  Combining her skills in SketchUP, In Design and Photoshop, with her natural gift for connecting with clients, her work is truly reflective of her Bachelor's Interior Design Degree from the Art Institute of California, San Diego, a CIDA accredited school.

Having recently moved to Phoenix, Karleigh is eager for new experiences and to see how beautiful the desert can be. In her free time, she enjoys taking walks in nature, socializing with friends and finding creative ways to add to the decor in her home.

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Maddy DeVries

Interior Designer
B.S. Interior Design, University of Bridgeport

Hometown: Medford, OR

Maddy is driven by the excitement of providing solutions to our clients’ design challenges. When our clients have odd corners, problematic layouts or unconventional requests, her wide range of connections with vendors in the industry allow her to propose truly unique solutions. She uses light, texture and color to create meaningful 3D perspectives in all her designs, a talent she developed previously working for photographer, food stylist and art director, Harry & David, in Oregon.

Blending the worlds of art and design, Maddy pursued her interior design studies at the University of Bridgeport, where her ambitions earned her the title of Magna Cum Laude, ASID UB chapter president and student representative to the Connecticut American Society of Interior Designer's (ASID) board. When Maddy isn't in the studio designing, you can find her with her husband and puppy finding new places to enjoy the desert atmosphere.

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Monica Milewski

Studio Manager
B.S. Psychology, Loyola University Chicago
M.S. Child Development, Erikson Institute
M.S.W. Social Work, Loyola University Chicago

Hometown: Chicago, IL

Monica is the secret weapon that most Interior Design firms wish they had! Her natural strengths balance our interior designers’ strengths perfectly, bringing accountability, steadiness, and follow through to each of our projects. Always seeking to grow both personally and professionally, Monica uses her zest for organization and client connection to manage the MCI team and monitor project progress!

Using her keen eye for detail, Monica has implemented structured workflows and processes to ensure projects are running efficiently.  Client satisfaction is her top priority, and her previous experience as a Kitchen and Bath Project Coordinator, helps her to understand client needs, and be a bridge of communication between clients and our team. In her free time, Monica uses the desert landscape as inspiration for her creative hobbies of photography, painting, and gardening.   

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Courtney Clark 

Interior Design Intern - Portland Office

Hometown: Portland, Oregon

Courtney’s sensitivity to color and creativity led her to start noticing how different spaces made her feel, which sparked her interest in design. She believes that a good design is founded in purpose, reason, and feeling, and that everyone deserves to experience this. Using her skills from SketchUp, Revit and Illustrator, she is able to create spaces that clients fall in love with.  Currently a student at the Oregon State University studying Interior Design with a minor in Business and Entrepreneurship, she’s become the perfect fit for our Portland office! She creates designs that solve problems and spaces that inspire and empower people who encounter them.

Having recently moved back to Portland, Courtney is ready to get back to her roots. You can find her downtown searching for the newest boutiques, at the trendiest coffee shops, or spending time with her family and puppy. Courtney loves traveling and experiencing new cultures, like riding a camel in the middle of the Mexican desert, which she just did recently.

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And Ranger, the wonder dog.

Security Intern

Ranger is the new kid on the team and he has very big dog booties to fill! He's in training for the Regional Head of Security position that was previously occupied by the very best good boy, Vern. Ranger hails from Mexico City and has done a lot of traveling in his rather short life so far. He is a guy who takes naps seriously and provides the team with lots of laughs while he's mastering his athletic abilities. He encourages the team to get up and move around throughout the day because he needs potty breaks every 20 minutes or so. He'll be making lots of appearances on our Instagram account, so be sure give us a follow!

For daily design process updates, before + afters, and exclusive designer tips, follow us on Instagram @mackenziecollierinteriors