Jamie Mammano


From the day that Chef Jamie Mammano opened the doors to Mistral in 1997, his biggest culinary venture yet was destined to become a legend of the Boston dining scene. A graduate of the Culinary Institute of America in New York, Jamie established a reputation for himself amongst the country’s most highly-regarded chefs during stints at The Jockey Club and Le Pavillion Restaurant in Washington DC, as the chef for the United States Ambassador to Spain, and 10 years spent in the kitchens of the Four Seasons Hotel Company, where he honed his culinary skills at the company’s Washington DC, Seattle, Chicago and Boston properties. 

Seeking the next big challenge, Jamie left the Four Seasons, and along with partners Paul Roiff and Seth Greenberg, created the concept for Mistral, a French/Mediterranean bistro in Boston’s South End. Through crafting the menu, hiring the staff, handpicking the tableware, choosing the décor and designing the kitchen, Jamie was able to give life to the restaurant he had always dreamed of and that Boston diners could not wait to frequent. Throughout the past 19 years, Jamie and Mistral have consistently delivered excellent food, exceptional service, and garnered numerous accolades including “Top 25 New Restaurants in America” by Esquire Magazine, “Sexiest Bar” by Food & Wine, and four “Best of Boston” awards from Boston Magazine. Jamie has appeared on NBC’s “Today Show” as well as CNN’s “On the Menu.” In June 1999, Nation’s Restaurant News named Mistral as one of “5 Hottest Restaurants in Boston” and in July of the same year, Jamie was invited to be a guest chef at the famed James Beard House.

Chef Mammano embarked on his second restaurant venture partner Paul Roiff in January 2003 with the opening of Teatro.  In November 2005, Jamie and Paul followed up their success when Paul made Jamie a partner in The Federalist. The team then opened Sorellina in January 2006, offering regional Italian-Mediterranean cuisine with a modern twist. In August 2007, The Federalist was transformed to Mooo, a modern steakhouse inside the XV Beacon Hotel. The latest venture, L’Andana in Burlington, MA, opened in October 2007, focusing on Tuscan Wood-Grilled cuisine. In 2013, Mammano and Roiff opened their newest concept, Ostra, a contemporary Mediterranean seafood restaurant.

Then, in 2011, Chef Jamie Mammano decided to take on a new challenge and explore his passion inspired by his family. In 2011, he opened Tortilleria La Niña, now Tortilleria Mi Niña®, and has been making authentic white corn tortillas and tortilla chips ever since.

Roberto "Tobe" Armendariz

Production Manager

Born and raised in Chihuahua, Mexico, Tobe followed his musical passion. In 1996, he participated in the Disney Special events groups and in 2002, he recorded his first LP and became part of “El Clan” a local band doing multiple shows around the North of Mexico. After graduating from University, Tobe in 2006, moved to the United States and began his journey with Chef Jamie Mammano working at Mistral in front of the house. There, he found his passion for culinary arts and hospitality.  In 2011, Tobe joined Tortilleria Mi Niña® as Production Manager to share his cultural heritage and help develop the recipes for  perfect tortillas like the one's he grew up with. As a young child, Tobe watched his Mom and Aunts making tortillas by hand and now at Mi Niña®, tortilla making has become his new passion. Being in the production room at every moment he is always making sure the tortillas and chips taste as good as the ones back at home.  

While Tobe is not overseeing the perfection in the production room, he is enjoying creating music in his home recording studio, hanging out with his family, and can sometimes be found around town racing go carts. 

Alexandra Steadman

Accounts Manager/ Marketing 

Alex Steadman joined the Mi Niña® team in 2014.  She attended Providence College in RI where she received a Bachelor’s Degree in Art History and Business.  Soon after graduating,  Alex moved to Boston to pursue her passion for the Food and Restaurant Industry and she quickly found a position working at Mistral in 2014.  When a position at Mi Nina opened up that would integrate Alex’s love for local food producers and her interest in marketing, design, and social media, she jumped at the opportunity.  Since joining the team, Alex has been an integral part of the rapid expansion of Tortilleria Mi Niña®

Originally from Minnesota, Alex remembers childhoods cooking with her mother, joining her at weekly farmers markets and helping out with dinner parties her family would throw.  Since joining the Mi Niña® team, Alex has a new found love and appreciation of Mexican cuisine and culture, and can be found often in the kitchen with her roommates trying out new recipes, mostly involving Mi Niña® tortilla chips. 

Paul Roiff


As one of Boston’s most acclaimed real estate developers, and known for pursuing projects that the real estate “establishment” has often deemed too daring, Paul possesses a drive and vision for urban architectural splendor that has led to the renaissance of some of Boston’s most treasured communities. Paul, who has been working in the field of real estate since the age of 18, originally planned to pursue a career in music, but found himself being drawn towards a love for urban architecture.

Throughout his career, Paul, who earned a baccalaureate and MBA from Boston University, and a JD degree from Suffolk Law School, has worked on the acquisition and renovation of Boston real estate in such diverse areas as historic rehabilitation, mill restorations, HUD projects, the development of hundreds of residential lofts in Boston’s Leather district and the development of a luxury 28-acre beachfront cabana club in Florida

In 1997, together with partners Jamie Mammano and Seth Greenberg, Paul built and became a co-owner of Mistral, a French/Mediterranean bistro located in one of his most successful developments, Boston’s Albert A. Pope Building. Quickly after the opening, Mistral was named one of the “Top 25 New Restaurants in America” by Esquire Magazine, “Sexiest Bar” by Food & Wine, and earned four “Best of Boston” awards from Boston Magazine.

His first foray into the luxury hotel world, Paul renovated a 1903 Beaux Arts building to create XV Beacon in January of 2000. In developing the hotel, Roiff adhered to the vision of a classic and elegant environment combined with modern style that would provide an unforgettable service experience for travelers, as well as a culinary destination, The Federalist, with an atmosphere reminiscent of the world’s most prestigious private clubs.

Paul followed up the success of Mistral and The Federalist, which is now Mooo, with three other restaurants: Teatro in January 2003, Sorellina in January 2006 and L’Andana in 2007, which he owns in conjunction with Jamie and The Columbus Hospitality Group. The latest additions to CHG are The Inn at St. Botolph and Ostra. Serving as president of Heath Properties, a real estate development and finance company, Paul has also served on the board of directors of a professional software company, and as a director of Capitol Bancorp in Boston.

In 2011, Paul joined Chef Jamie Mammano in the opening of Tortilleria La Niña, now Tortilleria Mi Niña®.

Mike Guerriero

Director of Operations

After 25 years in the retail food industry, Mike joined the Tortilleria Mi Niña® team as Operations Director in 2015.  He has been an integral part of its expansion.  Mike got his start in the food industry while in high school, taking a job at his uncle's pizzeria.  Several years later, Mike purchased the pizzeria he was working at and started Sports Page Pizza & Subs in Quincy.  

Later, Mike worked with Dunkin' Donuts franchises for 12 years, including the last nine years as a District Manager.  While with Dunkin' Donuts, Mike oversaw up to 10 stores in Downtown Boston.  He was a great contributor to his company and was named Franchisee Operator of the year in 2012.  

Mike’s other passions are sports, music, family and friends. Mike loves spending his free time with his wife and two young boys. 

Cory Lee Miller Sales & Demo Manager 


Cory Lee Miller

Sales & Demo Manager

Cory Lee joined the Mi Niña® team in 2017. She attended college in Boston where she received a Bachelor’s Degree in Merchandising & Marketing. Throughout college, Cory Lee explored the fashion industry, but soon learned her expertise was in Event Management through her role as corporate trade show and conference Planner at a Global Publisher. After several educational years, and a purchase of a new home on the South Shore, Cory Lee transitioned into her role as the Director of Events at the Red Lion Inn in Cohasset, MA. The opportunity to join Mi Niña® (a much familiar and beloved gluten free brand) arose shortly after, and Cory Lee was inspired to blend her organizational skills, event management, and utter love of foods together in one fantastic position!

Originally from northern New Hampshire, Cory Lee values the importance of spending time in the great outdoors and appreciates a good home cooked meal with family and friends. Cory Lee’s passions are kayaking, traveling, and hosting dinner parties alongside her husband in their Plymouth home.