Mark Nasvadi
I am a graduate of the University of Windsor, holding an Honours Bachelor of Commerce with a specialization in Accounting. My career began in larger accounting firms, where I gained valuable technical experience and a strong foundation in best practices. Over time, I discovered that my true passion lies in working closely with owner-managed businesses.
Building meaningful relationships with clients is at the core of my approach. I believe that truly understanding a client’s goals, challenges, and long-term vision is essential to delivering thoughtful, strategic advice. Taking the time to get to know each client allows me to provide tailored solutions that go beyond the numbers.
I am committed to maintaining the highest standards of ethics and integrity in every aspect of my work. Trust is the foundation of any successful professional relationship, and I strive to earn and uphold that trust with every client I serve.
Outside of work, I am an avid sports enthusiast who enjoys running, hockey, golf, and most physically active pursuits. I value the discipline, teamwork, and perseverance that athletics cultivate—qualities that I also bring to my professional life.
Sherry Nasvadi
Co purchased Deveau Accounting with her husband and has been an integral part of the firm’s growth and client focused culture. She originally joined the business as Office Manager, and over time her role naturally expanded to include bookkeeping and tax preparation.
With a strong background in hospitality and front desk operations, Sherry brings exceptional organization, warmth, and customer care to the firm. Her experience in service driven environments has shaped her approach—clients appreciate her welcoming presence, attention to detail, and commitment to making every interaction smooth and stress free.
Esther
Esther has a B.A. in Business Management and Organizational Studies from the University of Western Ontario as well as an Accounting Diploma from Fanshawe College. She has worked at other CA firms, including Davis Martindale, Deloitte and BDO Dunwoody. With over twenty years of accounting experience, Esther will play an integral part in Corporate and Personal tax work here at Deveau Accounting and looks forward to providing the ultimate customer service experience.
Rebecca
Rebecca holds a Bachelor of Arts degree from the University of Guelph, where she completed a double major in Management and Economics. She joined Deveau’s in August 2008, bringing with her a strong foundation in business principles and a commitment to delivering exceptional service. Over the years, Rebecca has become a valued member of the team, known for her professionalism, dedication, and warm presence at the front desk.
Brian Simmons
I hold a Bachelor of Arts from Western University and a Graduate Diploma in Accounting from Wilfrid Laurier University. With more than 25 years of experience in public accounting, I’ve worked with a range of mid-sized to international firms, providing trusted financial insight and strategic guidance to diverse clients.
Beyond my professional work, I’m passionate about nature, music—listening, writing, and performing—collecting vinyl records, and restoring vintage vehicles.