Mehran Jean-Michele Moallempour, who goes by Johnny professionally, has spent more than twenty-five years building MJM Interior Design into a San Francisco-based practice that handles everything from single-room refreshes to full residential and commercial construction projects. Based at 560 Miramar Avenue in the citys Ingleside neighborhood, the firm takes on remodels, ground-up new builds, project management, and historical building conservation, with particular attention paid to kitchens, bathrooms, and bedrooms alongside custom cabinetry, built-ins, and furniture designed specifically for a clients space rather than pulled from a standard catalog. Color consulting and floor planning round out the services, giving clients a single point of contact from early concept through finished installation.
A defining feature of the firms work is its global sourcing, with furniture, art, and materials brought in from Italy and France to anchor interiors that Moallempour describes as balancing contemporary design with lasting appeal rather than chasing short-lived trends. That international sourcing habit sets MJM apart from design firms that lean primarily on domestic or big-brand suppliers, and it shows up in projects that mix custom-built pieces with imported antiques and decorative objects sourced specifically for each commission. While the studio is headquartered in San Francisco, its project list extends well beyond the city, with work completed throughout the Bay Area in Oakland, Berkeley, Palo Alto, Napa Valley, and Sonoma, and additional projects reaching as far as Hawaii and Boston.
The firms reputation has been reinforced by outside recognition in recent years, including a win at the 2025 Luxe Red Awards and a listing in Architectural Digests Pro Directory, alongside a strong five-star client rating on Yelp. Those markers matter to homeowners vetting a designer for a significant renovation, since they point to sustained, verifiable work rather than a newer or unproven practice. The studio keeps regular business hours Monday through Saturday from 9 in the morning to 7 in the evening, closed Sundays, and prospective clients typically start the relationship with a direct conversation about a projects scope before any sourcing or design work begins.
The Ingleside neighborhood base places the studio in a largely residential part of San Francisco, a fitting home base for a practice whose client work leans heavily toward single-family and multi-unit residential projects even as it also takes on commercial assignments. Because Moallempour personally leads each engagement rather than handing projects off to a larger rotating team, clients working with MJM Interior Design typically deal with one consistent point of contact from the earliest concept conversations through final installation of cabinetry, furniture, and imported finishing pieces, which matters on the kind of multi-month renovation and historical conservation work the firm regularly takes on. That continuity, paired with direct sourcing relationships built up over more than two decades in the trade, is part of what has allowed the practice to take on projects well outside its home city without losing the level of custom detail its Bay Area clients expect.
For homeowners across the Bay Area looking to combine historical building conservation with internationally sourced furnishings and custom millwork, MJM Interior Design offers a two-decades-plus track record led by a single named principal designer rather than a rotating studio staff. MJM Interior Design is Johnny Moallempours San Francisco design practice, known for pairing custom cabinetry and full-scope renovation work with furniture and materials sourced directly from Italy and France.
