Not an agency.
Not a one-off freelancer.
Not an agency.
Not a one-off freelancer.
We're collaborators at heart—drawn to teams and founders building meaningful things.
With over 30 years of combined experience across agencies, startups, and global brands, we plug into teams to bring a practiced, strategic lens to complex and nuanced design challenges.
Whether at the start of something new or stepping in midstream, we integrate easily—aligning to your team's precise needs.
Sum is what happens when proven experience and seamless collaboration come together.
We're collaborators at heart—drawn to teams and founders building meaningful things.
With over 30 years of combined experience across agencies, startups, and global brands, we plug into teams to bring a practiced, strategic lens to complex and nuanced design challenges.
Whether at the start of something new or stepping in midstream, we integrate easily—aligning to your team's precise needs.
Sum is what happens when proven experience and seamless collaboration come together.
Not an agency,
not one-off freelancers.
Services
Strategy
Brand Identity
Digital Design
Interior + Environmental Design
Creative Direction
Design Systems + Rollout Support
Client Experience
Client Experience
Client Experience
SUM
Independent design collaborators Marissa Betley and Derek Smith—working across brand, strategy, digital, interiors, and environments.
STUDIO
Independent design collaborators Marissa Betley and Derek Smith—working across brand, strategy, digital, interiors, and environments.
SUM
Independent design collaborators Marissa Betley and Derek Smith—working across brand, strategy, digital, interiors, and environments.
STUDIO
©2025 SUM.STUDIO
This portfolio includes work from prior roles. All IP belongs to the respective clients.
©2025 SUM.STUDIO
This portfolio includes work from prior roles. All IP belongs to the respective clients.
©2025 SUM.STUDIO
This portfolio includes work from prior roles. All IP belongs to the respective clients.