Meet Our Team
Shawn V. Giammattei, PhD
Dr. Shawn Giammattei (he/him) is the founder of Quest Family Therapy and is a licensed family psychologist in Northern California, who specializes in couple and family therapy with a focus on the treatment of gender incongruence in children, adolescents and adults, as well as lesbian, gay, bisexual and transgender couple and family issues.
Dr. Lisa Richards, PsyD.
Dr. Lisa Richards (she/her) received her doctorate in clinical psychology, forensic track, from California School of Professional Psychology at Alliant International University. Dr. Richards is a member of the LGBTQ+ community and is also a certified LGBT-informed therapist by The Rockway Institute in San Francisco.
"Little" M Vila-Barrett, LMFT
Little (they/them) is a transgender rights advocate, transracial Indigenous adoptee from Colombia, a queer mixed-race person, community activist, and mental health advocate. Little has been working with young people in various levels of programming and community-based mental health roles for over 20 years.
Kimberly Liang, AMFT
Kimberly (she/they/ze/zir) received her master’s degree in Counseling Psychology from The Wright Institute in Berkeley, CA. She is a Registered Associate Marriage and Family Therapist supervised by Shawn V. Giammattei, PhD. while working towards licensure. Prior to graduating, she primarily worked with the mandated adolescent and young adult population for concerns around drug and alcohol use and anger management.
Caitlin Casey, ASW
Petra Janopaul, AMFT & APCC
Petra (she/her) graduated with a Masters of Art in Counseling Psychology from the Wright Institute (Berkeley, CA). She is a Registered Associate Marriage and Family Therapist and a Registered Associate Professional Clinical Counselor, supervised by Shawn V. Giammattei, PhD.
Jill Rees, PhD
Jill (all pronouns) is a licensed psychologist who has worked with Sonoma County teens, adults, partners, and families for over 20 years. With her collaborative and playful approach, Jill supports people to live more authentic lives. She loves to help people find their way to the change they are seeking, whether it is improving their mood, deepening their connection with themselves and loved ones, or finding and expressing their authentic selves.
Kate Threlfall, PhD
Dr. Kate Threlfall is a systemic therapist who supports client-led changes with a collaborative and integrative approach: blending evidence-based treatments (such as CBT, DBT, ACT, and EMDR), utilizing a narrative lens that is deeply grounded in a relational framework. Kate is a licensed psychologist supervised by Jill Rees, PhD. while working towards California licensure. Kate works with individuals, families, and their systems in a solution focused and strengths-based way. As a compassionate clinician providing gender affirming care is paramount.