Featured Members

Featured Sponsor

Mary Schulze, GRI, SRES

Realtor, Intero Real Estate Services
Founder, Mt. Diablo Business Women

Mary Schulze founded MDBW in 1994 to help local businesswomen build business relationships, referral networks, and partners. Mary credits the group with helping businesses grow and succeed through the sharing of knowledge, referrals, and partnerships.  Today the organization’s members represent a variety of business sectors. Mary remains active in the group. She serves on the Board of Directors as program chair, and is responsible for bringing speakers on business and personal development topics to the group’s monthly events. 


Mary’s vast network of contacts has helped her to be a successful real estate consultant with Intero Real Estate Services, serving Contra Costa and El Dorado counties. She helps clients sell their houses, and buy a dream home in what is now a very competitive market. She enjoys finding the right home for each buyer, whether they are a first-time homebuyer or a senior who is downsizing. 

Clients benefit from Mary’s almost 20 years of experience in the San Francisco Bay Area and the Sacramento region, as well as her negotiating experience, which provides clients with the fair price on purchases and closing the deal. As a realtor with Intero Real Estate Services, clients can have worldwide and local exposure and marketing, all of which can result in swift action on multiple offers. 

The best referrals for Mary are new business lenders, insurance agents, contractors, handyman services, divorce attorneys and CPAs.  She also receives many referrals through word-of-mouth from happy clients, along with the many friends and business contacts she has met through her years as the founder and member of MDBW.

In addition to her work as a realtor, Mary is active in the community. She contributes a portion of her transactions to a non-profit focused on serving children and the elderly in the community. She is also a member of the Assistance League of the Sierra Foothills, a non-profit that has helped to support over 1,500 children and adults in the community. 

When she’s not working, Mary enjoys cooking, playing the piano, learning to speak Italian, playing with her dog, Maxx, a giant schnoodle, and being with family and friends. 

Visit Mary’s website to learn more about her. 

Featured Member

Manya Helgerson Casto, has 10 years of experience helping people who are aging into Medicare to review the available insurance options and, if still working, determine whether to leave their employer’s insurance coverage. For those who are fearful or confused about navigating Medicare, Manya can advise and counsel them through the process. Clients who work with Manya gain peace of mind knowing that she is an experienced, qualified insurance agent who has helped them make the best choice for their specific situation. 

In addition to helping clients, Manya has also counseled those interested in working as a Medicare Plans Insurance Agent. She has trained several women who have retired from previous occupations to find success in the industry. 

Manya is a long-time member of Mt. Diablo Business Women and has served on its board of directors, including as the organization’s president. She enjoys MDBW for the friendships she’s made. 

A great referral source for her is a benefits manager from a small business who assists employees transitioning into retirement, or anyone going on to Medicare.

When she’s not helping clients work through Medicare options, Manya can be found volunteering at the American Cancer Discovery Thrift shop one afternoon a week. 

Prior to COVID, Manya enjoyed traveling, which in years past included seeing new sights, with her husband, a retired attorney, who enjoyed magic as a hobby. Their travels also involved Manya assisting her husband during his magic show performances. 

To get in contact with Manya, reach out to her by email

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Manya Helgerson Casto 

Independent Career Agent, United HealthCare