NEW YORK, NY, March 23, 2026 /24-7PressRelease/ -- Mark James Diffley is a distinguished biographee of Marquis Who's Who. He was recently spotlighted in New York City's Times Square on a 22-story screen that is passed by an estimated 1.5 million people daily. As in all Marquis Who's Who biographical volumes, individuals profiled are chosen from among a pool of the most prominent professionals and are selected on the basis of current reference value. Factors such as position, noteworthy accomplishments, visibility, and prominence in a field are all taken into account during the selection process.

Mr. Diffley has enjoyed a notable career spanning three decades in financial management, business strategy and the development of finance operations for technology companies and startups. As the founder and principal of Windward Mark Advisory CPA PLLC in New York City since 2023, he has led the firm with a focus on staying at the forefront of technological advancements and software developments. In this capacity, Mr. Diffley engages with a diverse client base, consulting with engineers and startups to address their unique challenges, building effective teams and processes, measuring performance outcomes and fostering collaboration to drive business success. His approach is rooted in interpreting financial data beyond traditional accounting, using numbers to inform strategic decisions and future planning. This innovative perspective has enabled him to transform the conventional accountant role into an engaging and fulfilling career path, a professional achievement he considers his most notable.

In addition to his leadership at Windward Mark Advisory CPA PLLC, Mr. Diffley has served as an expert with Primary Venture Partners since 2024, guiding emerging businesses in the venture capital space. He previously served as a finance advisor to Etna Lobas in 2024, contributing his expertise to support the company's financial strategies.

From 2021 to 2023, Mr. Diffley was the interim chief financial officer at Parity Technologies, overseeing financial operations during a period of significant growth and innovation in blockchain technology. Previously, he held concurrent roles as the chief financial officer at both Independence USA PAC and Hawkfish LLC from 2020 to 2021, where he managed complex financial structures for organizations operating at the intersection of technology and public affairs. During this same period, Mr. Diffley was also a senior director at Geller & Company.

Among numerous other noteworthy roles throughout his tenure in the industry, Mr. Diffley held appointments with Blink Health, SeatGeek, and KAYAK Software, where he played a pivotal role in managing global finance operations for one of the world's leading travel search engines. His earlier tenure at Take-Two Interactive Software Inc. included several leadership positions, as well as positions at CBS Corporation and Disney ABC Television Group under the Walt Disney Company umbrella, after initially working as a senior associate at PricewaterhouseCoopers in New York from 1995 to 1998.

Mr. Diffley's academic background included earning a Bachelor of Science in accounting from Miami University in Oxford, Ohio, in 1995. He also became a certified public accountant through the New York State Education Department in 1998. Mr. Diffley's educational journey was shaped by family influence, as his father and brothers are all accountants. He also notes his curiosity and willingness to explore new opportunities as key drivers behind his success, emphasizing that connecting with others and asking questions have been instrumental throughout his career.

Beyond his education, Mr. Diffley is a member of the American Institute of Certified Public Accountants and remains actively involved in professional networks that support ongoing learning and industry advancement. Deeply engaged in civic activities and nonprofit leadership, he has served as the treasurer on the board of Open House New York, an organization dedicated to increasing public understanding of New York City's built environment through annual festivals and year-round programming. In his role, Mr. Diffley helps organize major events, such as this year's water-themed festival in partnership with NYC Water Company. In addition to Open House New York, he has volunteered with RefugePoint since 2024, a nonprofit initially focused on refugee resettlement in Nairobi that now supports immigrants globally through employment assistance, family reunification services and medical care.

Throughout his career, Mr. Diffley has been recognized for his willingness to take on new challenges and innovate in his field. Looking ahead, he aims to help others realize how technology can enhance lives and transform work environments while fostering healthy democratic engagement through community participation and volunteering efforts. Mr. Diffley also plans to expand his consulting practice by adding team members and taking on more clients while continuing to reside in New York City and travel professionally.

About Marquis Who's Who®:
Since 1899, when A. N. Marquis printed the First Edition of Who's Who in America®, Marquis Who's Who® has chronicled the lives of the most accomplished individuals and innovators from every significant field of endeavor, including politics, business, medicine, law, education, art, religion and entertainment. Who's Who in America® remains an essential biographical source for thousands of researchers, journalists, librarians and executive search firms around the world. The suite of Marquis® publications can be viewed at the official Marquis Who's Who® website, www.marquiswhoswho.com.

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