Meet Our Team

Mike, who is a Certified Financial Planner (CFP) brings more than 30 years’ experience in investment services. Mike began his career working for Merrill Lynch and Ayco, a Goldman Sachs Company. He was most recently a Senior Vice President for Legacy Portfolio Management, Legacy Banks investment division.

Mike is the Senior Vice President of The Greylock Investment Group, and holds an MBA from the State University of New York at Albany, as well as a Bachelor of Arts in Economics from the same institution. He holds the Series 7, General Securities Representative, Series 63, Uniform Securities Agent State Law Examination, and the Series 65, Uniform Investment Adviser Law Examination held under LPL Financial.

Mike has been with Greylock for more than 15 years.

Brian Astorino, CRPC® conferred by College for Financial Planning, is a Chartered Retirement Planning Counselor, Vice President, and LPL Financial Advisor, at Greylock Investment Group. Brian’s objective is to develop long-term financial strategies that are unique to each client and consistent with their investment goals and risk tolerance.

Brian joined Greylock Investment Group in December 2008. Prior to joining Greylock, he spent eight years at Merrill Lynch, in various roles. Brian graduated Magna Cum Laude from Massachusetts College of Liberal Arts, earning a B.S. in Business Administration. He holds the Series 7 and 66 registrations with LPL Financial, and his Massachusetts insurance licenses.

Brian is a member of the Board of Directors of Goodwill Industries of the Berkshires. He has served on numerous boards in the past, including, President of the Adams/Cheshire Little League & coach for 13 years, a member of the Adams Cheshire Regional School District, School Committee, and Cheshire Elementary School Advisory Council, as well as the Berkshire Creative Economy Council, and the Berkshire Leadership Program, through the Berkshire Chamber of Commerce.

Brian resides in Cheshire, Massachusetts with his wife Laurie and their three children. In his spare time, he enjoys having new experiences with his family including traveling, taking road trips to try new restaurants, going to concerts and attending sporting events.

Michael DuPont is a Certified Financial Planner (CFP®) and holds his Series 7 and 66 securities licenses through LPL Financial. Michael strives to build strong relationships and financial strategies that are customized to the specific needs and interests of each of his clients.

Michael joined Greylock Investment Group in January of 2018. Prior to joining Greylock, he was at Andiamo Partners in New York City where he worked with senior software and infrastructure technologists within the financial industry. Michael graduated from Columbia University in 2013, where he earned his bachelor’s degree in political science, with a primary focus in international affairs. Michael is also a member of the Phi Theta Kappa National Honor Society.

Out of the office Michael enjoys golfing across Berkshire County, sailing along the coast and spending time with his wife, Shawnee, and their two children in Lenox.

Marissa Main is an LPL Financial Advisor who holds both her Series 7 and Series 66 securities licenses through LPL Financial. Marissa’s approach with clients has always been to listen closely to their needs and build a relationship first. This allows her, along with her client to work together and develop an investing strategy that is right for their unique situation and create a long-term relationship.

Prior to joining Greylock Investment Group Marissa worked at Greylock Federal Credit Union for over 17 years in the Branch and Retail Division as the Assistant Vice President of their Member Service Operations. During her time at the Credit Union she was responsible for working with the Branch Retail Team, creating efficiencies within the Member Service areas as well as major projects such as Core System updates and mergers with other Credit Unions.

Marissa serves on the Board of Directors for both Northern Berkshire United Way as well as Berkshire Family and Individual Resources (BFAIR).

Marissa is a lifelong resident of Berkshire County and currently lives in Cheshire with her son. 

Gregory Dieterich is an LPL Financial Advisor Representative, currently holding the Series 63 and 65 securities licenses through LPL Financial. Gregory works with Greylock Investment Group clients in the Allendale location.

Gregory joined the Greylock team in January of 2017. Prior to joining Greylock, Gregory was the Sales Manager in the Lanesborough Best Buy location, where he has over 13 years of customer service and leadership experience.

Gregory enjoys spending time with his family going camping, playing board games, and building Legos.

With a passion for helping people and an eye for organization, Taylor supports our team of advisors and their clients by streamlining practice operations, executing trades, managing client onboarding and more. She serves as the primary liaison between financial advisors, custodial institutions, and clients to deliver responsive, high-touch service.

Taylor is Series 7 and Series 66 licensed through LPL Financial and holds her Bachelor of Arts in Psychology from the University of Colorado at Boulder.

When not at work, Taylor can be found hiking in the beautiful Berkshires with her dog Dash, enjoying live music at Balderdash with friends, or planning her next trip to the beach.