The Treehouse Team

We have been serving the San Ramon Community for over 25 years and we would like to help you and your family.

Executive Staff

Clinical Staff

Master Clinician

Mary Ruth Cross

Owner, RPT-S

Mary Ruth Cross is a licensed Marriage and Family Therapist and Counselor Educator with over 30 years experience in the mental health field. Mary Ruth has provided counselor education with the University of Phoenix Bay Area Campus. She has also been on faculty with John F. Kennedy University and been a nationally recognized speaker on play therapy. She works in private practice in San Ramon CA and is the CEO and Owner for Treehouse Family Counseling Services, PC where she trains and supervises associates. Mary Ruth is a Registered Play Therapist Supervisor. Mary Ruth is also the founder of Cross...

Clinical Staff

Christine Holmberg

Christine (she/her) is a licensed Marriage and Family Therapist. She has over 13 years of experience working with children, teens and their families. Christine holds a Bachelor of Arts degree in Psychology and a Master of Arts degree in Counseling Psychology with a focus on transpersonal studies. Christine’s background includes providing therapy on-site in various public schools throughout the Bay Area, short term family counseling, and trauma-informed community-based services to foster care youth and their families. While Christine has experience providing therapy to individuals of all ages, she has a keen interest and passion for working with children and adolescents...

Michelle Culver

Michelle Culver is a licensed Marriage and Family Therapist with over 15 years’ experience in the field of trauma through various roles (researcher, educator, author, therapist). Michelle’s background in developmental psychology has informed her clinical work with clients of all ages. She has worked with clients through each developmental stage, from age 1 to adulthood, and enjoys witnessing how therapy can help clients achieve their developmental and relationship goals. Michelle’s clinical experience includes: child abuse, trauma, anxiety, depression, sensory challenges, emotion dysregulation, relationship difficulties, and attachment issues.

Associate Therapist

Marina Blalock

Marina Blalock is an Associate Marriage and Family Therapist working under the direct supervision of Mary Ruth Cross, LMFT. She received her M.A. in Counseling Psychology from JFK University in Pleasant Hill, California. Marina is trained in Solution-Focused Therapy and understands the importance of resiliency, recovery, and instilling hope in her client’s healing journey. She enjoys working with families in a collaborative and supportive way. Marina is an authentic and genuine voice in the playroom.  She uses play therapy with children, teens and families to help them grow and change. Marina has provided therapy in community and school-based settings. Her...