California Elder Law & Estate Planning Attorney Welcome! Horizon Elder Law & Estate Planning, Inc. offers quality Estate Planning for singles & couples and serves our senior population by providing assistance with governmental entities and long-term care planning. The firm also offers services in probate, guardianship and conservatorship administration in Alameda County, Contra Costa County, Alamo, Antioch, Rossmoor, San Ramon, Concord, Danville, Dublin, Moraga, Pleasanton, and throughout the state of California.