We are consummate professionals. We are confident in our skills, and yours. We believe prudence, patience and even-handedness should be apparent in all our interactions, with every member of our network. As a Sienna partner, you are part of a mature and experienced team that is committed to affecting positive growth and change - whether it’s within the emerging growth business sectors, or at a greater community level.

The Sienna Foundation is a private foundation formed by Dan and Michelle Skaff to provide a formal vehicle for a longstanding practice of contributing a share of Sienna profits to charitable causes, many of which are in the San Francisco Bay Area. The mission of the Sienna Foundation is to improve the lives of children in underserved communities. Contributions are focused in the areas of youth arts and education, at-risk children's programs, and other community outreach initiatives where the Foundation's resources can be utilized to enhance education and well-being.

Some of the organizations sponsored by the Sienna Foundation include:

- Wilmar Center for Berieved Children
- Bay Area Discovery Museum
- San Rafael, Stinson Beach, and Marin City Public Libraries
- San Pedro School
- Larchmont School
- Marin City Schools
- St. Francis School
- South San Francisco MLK Elementary School
- Vector Theatre Company
- Kids Make a Difference Scholarship Programs
- Peninsula Meals on Wheels
- YMCA of the East Bay
- San Francisco Art Institute
- Sonoma Valley Museum of Art
- All Stars Helping Kids
- Villa Montalvo Center for the Arts
- St. Vincent's Soup Kitchen
- Canal Community Alliance
- Avon Breast Cancer Foundation
- Glide Memorial Church
- Project Imagine
- DrawBridge
- Iniece Bailey Infant/Toddler Center
- Harvard College Fund Scholarship Programs
- Sierra Club Foundation
- Canal Childcare Center