About Seriatim

At Seriatim, our team is the heart of everything we do. Founded by Sonya Weisshappel in 1999, Seriatim has grown into a trusted, woman-owned business dedicated to providing personalized organizational and logistical solutions. But it’s not just about the work we do—it’s about the way we do it. Our team is made up of highly skilled professionals who approach every project with the same level of care, empathy, and commitment that we would give to our own families. We understand that transitions—whether moving, downsizing, or organizing—can be overwhelming, and that’s why we’re here: to support you every step of the way.

Each member of our team brings a unique blend of expertise, compassion, and professionalism to the table. We take the time to listen to your needs, understand your goals, and create customized solutions that reflect your values.

Our mission is to provide you with a seamless, empowering experience that allows you to focus on what matters most—while we handle the details with the utmost respect and precision.

A group of ten Seriatim employees, casually dressed, sit and stand on the brownstone steps of an urban building, smiling at the camera.

Where Do I Even Begin?

Feeling the weight of a life transition? Not sure where to start? Discover how prepared you are for life’s transitions and get an instant report based on Sonya Weisshappel’s expertise with our free questionnaire (it only takes 2 minutes!)

FOR PROFESSIONAL ADVISORS

The Missing Piece
in Client Planning

Managing a legacy requires seamless collaboration. We replace siloed information and outdated binders with one secure, shared space. Here, the wealth manager, estate attorney, insurer, and family can see the same plan and access the same streamlined documents, ensuring everyone is working in harmony.

Learn more about our community of trusted advisors, and if you have a client whose needs reach beyond the scope of your services, don't hesitate to reach out. We are here to help ease transitions. 

A group of people planning out organization with sticky notes on a glass window