Stephan P. McMahon
CPA & CVA

Stephan has a sweet 16 years of experience working with closely held businesses. Instinctually, Stephan founded SPM & Co to extend his passion for growing a unique and distinctive experience for those on his team as well as each of his clients. This experiential environment was designed to produce first-class results that have a positive, long lasting impact on his clients, the community, and last but not least… his team members and their families.
Stephan focuses on working with his clients to provide them with the connected knowledge and tools to make confident, strategic decisions for their companies, thus bettering their long-term success. Given the current business climate, as challenging as it is, Stephan sees it as an opportunity to bring fresh ideas and creative solutions to his clients.
Stephan grew up spending summers on the Cape with his family until they eventually made it permanent. Settling into Harwich at the start of high school Stephan quickly immersed himself in the Cape lifestyle – complete with a rusty soft–top Jeep. After graduating as a Harwich High School Rough Rider, he joined the Navy and served 8 years as an Avionics Technician, completing 3 overseas deployments all on aircraft carriers – obviously saltwater runs through his veins. During this time Stephan also earned his degrees in Business Administration and Accounting & Finance. Upon his transition out of the Navy, Stephan started his career in public accounting working for a large CPA firm in Portland, Maine until his wife decided it would be best to move back to Cape Cod to raise their young family and dig their roots into the community where they would start an accounting and advisory firm that would help small business owners in the community thrive.
Stephan is highly involved in community endeavors on the Cape. He feels strongly about leaving a positive imprint on people’s lives both through professional and personal relationships, which is exemplified by his role on the Board of Directors for the Cape Cod Chamber and as President (Past) of the Board of Directors for the Yarmouth Chamber of Commerce, as well as past and present participation in support of the YMCA of Cape Cod; Cape Kids Meals, WellStrong and the Cape Cod Challenger Club (to name a few).
Personally, as a husband and father of two, time with family is paramount. Whether it is early morning water skiing sessions with the kids, coaching just about every sport, cheering on the sidelines of every Monomoy High School field hockey game, or family hikes that magically always end at a brewery – making time for family is critical to having some semblance of balance and true happiness.
Barb Howell
Client Experience Associate

Barb joined Stephan P McMahon & Company as the Office Administrator in October of 2022.
She has more than 20 years of experience in client service, sales, marketing, and project management within a variety of verticals. Barb honed her organizational skills working as a Senior Account Director at an advertising agency, a Program Quality Coordinator in higher education, and as an Office Manager/Marketing Specialist in telecommunications. She has outstanding people skills and a knack for making clients feel comfortable.
In 2018, Barb moved to the Cape from Denver with her husband and two children to get away from the hustle and bustle of the big city, and to live where her family has been vacationing for decades. When she’s not multitasking for clients and the SPM&Co Accounting Team, you will find Barb running, hunting for bargains at the thrift store, or eating a hot fudge sundae at one of the local ice cream shops.
Brooke Labrie
Client Experience Associate

Brooke earned her Bachelor of Science degree in Business Administration from Western New England University. Prior to joining the SPM&Co team, Brooke’s work experience extends to working in the accounting office of a local small business before making the switch to public accounting.
Brooke’s background in payroll processing, bookkeeping, and preparation of tax returns along with her stellar internal and external client service skills allow her to contribute to a myriad of company functions supporting the SPM&Co team while ensuring our clients an excellent experience.
Outside of the office, Brooke enjoys traveling, playing sports, and taking her dog, Kona, on long walks by the beach.
Desiree McGee
Senior Tax Associate

Desiree brings over nine years of experience in public accounting, with a strong background in both audit and tax services. Having worked at firms of various sizes, she has developed valuable insight into the challenges businesses and individuals face.
She earned her bachelor’s degree in Accounting from the University of Massachusetts, Lowell. Desiree’s expertise in both audit and tax make her a great addition to the SPM & Co. team, and we are excited for the knowledge and perspective she brings to our clients.
Originally from Acton, MA, Desiree now lives in Pepperell, MA, with her husband, two children, their dog, and a small flock of chickens. Outside of work, she enjoys flower farming and spending time outdoors with her family.
Rachel Creswell, CPA
Senior Accounting Associate

Having grown up on Cape, after her initial industry experience was gained as an auditor at BDO, Rachel Creswell returned from Boston to establish her roots in the place she has always called home. During her tenure at BDO, she worked with many different professionals in various departments, which eventually pointed her in the direction of tax—a move we are grateful for!
Rachel joined SPM&Co in January 2024 as an accounting associate. Her passion for accounting began at the Isenberg School of Management at the University of Massachusetts, Amherst, where she earned both her bachelor’s degree and then her Master of Science in Accounting.
Rachel takes a “long-term” perspective to her career aspirations and is incredibly goal-driven. Her commitment to the profession is evident, as Rachel obtained her CPA and truly began to execute bigger plans for her career – and we are excited to see her progress at SPM&Co.
Rachel’s can-do spirit, curiosity, and genuine desire to use her knowledge to help change our clients’ lives make her a perfect fit for SPM&Co and a great addition to the team.
Outside the world of accounting, Rachel is an avid traveler. Her bucket list begins with visiting various states within the US, and she plans to explore many different countries and cultures in the years to come. Most weekends, you will find her playing intramural sports, reading on the beach, or facetiming her twin sister about some spontaneous trip she’s about to go on.
Jelyn Tabanas
Accounting Associate

Jelyn Tabanas joined SPM&Co in July 2025 and brings over five years of general accounting experience, including accounts payable and receivable, bookkeeping, inventory support, and financial reporting.
She earned her Bachelor of Science in Accountancy from La Salle University–Ozamiz and is known for being dependable, detail-oriented, and consistent in her follow-through. Jelyn helps ensure the numbers behind your business are reliable and timely, creating the clarity our team needs to guide stronger decisions.
Prior to joining SPM&Co, Jelyn participated in TOA Global’s U.S. Accounting Accelerator Program, where she expanded her understanding of U.S. accounting standards and was recognized as an outstanding trainee in her batch.
Outside of work, Jelyn enjoys listening to music, watching Korean dramas, and staying active through running and jogging.
Regine Lorzano
Accounting Associate

Regine Lorzano helps bring structure and follow-through to the day-to-day financial details that keep a business running smoothly. She joined SPM&Co in July 2025 and is known for her steady, detail-driven approach—helping ensure information is accurate, organized, and easy for clients to rely on.
Regine earned her Bachelor’s degree in Accountancy from St. Paul’s School of Professional Studies in Palo, Leyte, Philippines, and holds certifications in Bookkeeping and as a Tax Technician. Before joining SPM&Co, she worked in assurance and accounting roles supporting audits, reconciliations, and month-end reporting.
Outside of work, Regine is an adventurer at heart. She enjoys traveling, hiking, and spontaneous getaways. In quieter moments, she loves binge-watching K-dramas and solving mysteries—curiosity that carries into her work and continuous learning.