About Us.

Mackenzie Collier Interiors is a full-service residential & commercial interior design team in the heart of downtown Phoenix's historic Roosevelt Row, 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. 

Phoenix Interior Designers Mackenzie Collier Interiors



Mackenzie Collier

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

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. 


Aleah Carr

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

Specializing in AutoCAD and SketchUp, Aleah brings a unique, tech-savvy form of concept development to the team, along with a creativity and originality that is all her own. Born and raised in El Paso, Texas, Aleah relocated to Phoenix to attend Arizona State University, where she earned a bachelor's degree in Interior Design. She joined the MCI team as an intern and has been bringing fun, funky elements to the table ever since. Throughout the years, Aleah has worked her way to the top of the ranks as Interior Designer and Project Manager, serving as the primary contact for clients and contractors and overseeing project details from start to finish. 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.


Yoselin Castro

Interior Designer
A.A. Interior Design, Phoenix College
B.A. Interior Design, Northern Arizona University, May 2019

Yoselin received her associate's degree in Interior Design from Phoenix College and is currently furthering her design education at Northern Arizona University. She is determined and committed to bringing a creative and vibrant view in her designs as she skillfully balances form, function, and budgets. 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.


Jessie Wickersham

Marketing Director
B.A. Creative Writing, University of Central Florida

Resident wordsmith and marketing expert Jessie got her start in communications in the Sunshine State, where she spent time working for a nonprofit and hanging out with astronauts. Prior to moving to downtown Phoenix in 2015, Jessie spent three years in Virginia’s Shenandoah Valley before packing her things and heading across the country to spend a month in the High Sierra backpacking the John Muir Trail. On weekends, she’s either hiking with friends, playing music for her dog Partner, or speaking in an old-timey voice for no particular reason.


Monica Milewski

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

Always seeking to grow both personally and professionally, Monica aims to add her zest for organization and client connection to the MCI team! Originally fueled by a desire to understand people on a deeper level, she received her Masters of Social Work and Child Development back in her hometown of Chicago. Life shifted her direction into the world of design, and she spent three years as a Project Coordinator at a kitchen and bath showroom. Deciding it was time for a change from the cold, cloudy midwest, Monica sought more sunshine and moved to Phoenix. Here, she seeks to engage with the community and share how MCI can transform their spaces into interiors that are a beautiful showcase of personality. Monica hopes the desert landscape will serve as inspiration for her creative hobbies of photography, painting, and gardening.  

Vern the Design Dog

And Vern, the wonder dog.

Regional Head of Security

Vern has been our head of regional security for over a decade. His encouragement and positive morale are essential to our daily office operations. He puts in long hours snoozing on his dog bed and making sure all team members get a quality dog petting session in each day. Beyond that, he even cleans our empty yogurt cups, greets our visitors, and offers his input on many complex design decisions. He invites you to come by our office and say hello!