Amy is a seasoned clinician with over 25 years of experience providing psychotherapy to individuals and couples. She has maintained a private practice since 2009 and brings extensive training across multiple evidence-based and depth-oriented treatment modalities. Her clinical work is informed by direct experience in acute trauma and high-acuity crisis settings, lending a grounded, real-world perspective to her practice.
Appointments available within 3 weeks
Amy Mason, LISW, CFRC
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Amy provides specialized therapy for couples experiencing relational distress, including recovery from infidelity, erosion of emotional and physical intimacy, and acute relationship crisis. She is trained in a model that is structured, solution-focused intervention model with an established track record of stabilizing and restoring committed partnerships. Her couples work is grounded in the position that relationship dissolution is not an inevitable outcome, and that targeted clinical intervention can produce meaningful and lasting change even in high-conflict or ambivalent presentations.
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Amy holds certification as a Certified First Responder Counselor (CFRC) and carries specialized clinical expertise in the assessment and treatment of simple and complex PTSD, including the delivery of Prolonged Exposure therapy. Her practice maintains a dedicated focus on serving Law Enforcement, Military Personnel, Veterans, First Responders, and their family members — populations for whom occupational culture, duty-related trauma, and stigma around help-seeking require a clinician with specific training and contextual competence. She is experienced in crisis intervention, Critical Incident Stress Management (CISM), and psychological debriefing following workplace violence, traumatic incidents, and other high-stress operational events.
Appointments available within 2 weeks
Sarah Prochaska, LMSW
Sarah has over 20 years of experience helping adults work through mental health challenges in both outpatient and inpatient settings. She earned her degree from the University of Iowa School of Social Work and joined Mason Associates in 2024. Over the years, she has developed a strong focus on supporting older adults.
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She works with people dealing with anxiety, depression, stress, grief, and relationship concerns. Much of her work centers on the unique challenges that can come later in life, including changes in health, independence, and identity. She has experience helping individuals and families navigate Parkinson’s disease, end of life transitions, and other major life adjustments.
Sarah also supports people who are looking back on their lives and thinking about things like regrets, relationships, or questions about meaning and legacy. She helps clients talk through these experiences in a way that brings understanding and a sense of peace, rather than feeling stuck.
Her approach combines practical tools from cognitive behavioral therapy with a person-centered style that respects each individual’s values, history, and goals. Sessions are structured when needed, but always shaped around what matters most to the person she is working with.
Sarah is known for being calm, steady, and easy to talk to. She creates a space where people can take their time, feel heard, and work through complex concerns at their own pace
Evening appointments available within 2 weeks
Cameron Hanson, LMSW
Cameron received her BA from Iowa State University and her Masters of Social Work from the University of Northern Iowa. She has over 15 years’ experience working with adults in various settings including residential, outpatient and mental health agencies. Cameron joined Mason Associates in 2022. She is trained and specializes in Cognitive Behavioral therapy. Cameron is highly skilled in working with adults struggling with anxiety, depression and other mood related issues.
Marcia Gilbert, LMSW
Not accepting new clients at this time
Marcia received her BSW and MSW from the University of Iowa. She has over 13 years’ experience working with adults in inpatient and outpatient settings. Marcia joined Mason Associates in 2024. She specializes in grief support, helping individuals process and find healing after profound loss . She is highly skilled in working with adults struggling with anxiety, depression, complex grief, end of life planning and major life transitions.
Erin has over a decade of experience helping adults work through challenges that don't have a quick fix — chronic illness adjustment, caregiver burnout, grief, and the compounding stress of major life change. Her career spans hospital-based and home care settings, which gave her a ground-level understanding of how physical health, relationships, finances, and emotional wellbeing collide and influence one another. She works with young adults through older adults, with focused training and interest in relationship concerns, grief and loss, and stress management.
Now accepting new clients
Erin Sieh, LISW
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Where many people wait until they are overwhelmed to ask for help, Erin specializes in meeting clients at exactly that point — and helping them sort through it systematically. She listens closely, asks the right questions, and helps people identify what is actually driving their stress or stuck patterns before building a clear, realistic path forward. Her style is steady and unhurried, which tends to appeal to people who have been carrying a lot on their own and need a space that is structured but not rushed. Erin works best with people who are ready to do the work and want a therapist who will be honest, consistent, and genuinely invested in their progress.
Courtney Vassiliades, LISW, OSW-C
Saturday appointments available within 2 weeks
Courtney has over a decade of experience helping people navigate some of life's most demanding situations. Her background in medical social work at the University of Iowa Hospitals and Clinics trained her to work quickly and effectively with people in crisis — identifying unhelpful thought patterns, reframing overwhelming situations, and helping people focus on what is actually within their control.
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In her work with adults, Courtney specializes in the stretch of life where everything seems to hit at once — kids, marriage, a career, and aging parents, all competing for your time and energy. She also works with people struggling to manage their emotional health in a world full of noise, unrealistic expectations, and the constant pressure of social media. Her approach is practical and goal-oriented. She meets clients where they are and helps them understand the connection between their thoughts, feelings and behaviors. She works with clients to provide concrete tools to manage anxiety, stress, depression, grief and life transitions. Sessions are focused on where you want to go and what it takes to get there. Courtney's style is straight forward and direct, with a genuine investment in helping people make real and lasting change.
Accepting new clients.
Evening and Weekend hours available.
Bryan Mason, LMSW
Bryan’s path into therapy developed as he worked closely with people facing emotional, relational, and life-related challenges. Before entering clinical social work, he worked in healthcare leadership and operations, where he became increasingly drawn toward the human side of the work: how people cope, adapt, struggle, recover, and search for meaning during difficult periods of life.
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In addition to his professional background, he has led men’s groups and worked with individuals in faith-based settings around questions related to identity, purpose, relationships, addiction, and personal growth. Much of that work has involved helping men better understand themselves, strengthen their relationships, and become more intentional husbands and fathers. While Bryan’s faith informs who he is as a person, his approach to therapy is grounded, practical, and centered on the needs and goals of each individual client.
Bryan’s clinical training has included supporting adults affected by anxiety, depression, trauma, substance use, and the broader patterns that can leave people feeling stuck or disconnected from themselves and others. Sometimes those patterns do involve substances, but many self-defeating habits can gradually take over life, leaving people feeling stuck despite a genuine desire for change.
Bryan takes a flexible and collaborative approach to therapy. Some clients benefit from a reflective space to better understand themselves, their relationships, and the deeper patterns shaping their lives. Others prefer a more direct, structured approach focused on practical skills, problem solving, and measurable progress. He often draws from approaches such as CBT, DBT, and IBM while adapting the process to fit the individual.
Above all, Bryan believes meaningful change happens when people feel safe, can speak honestly, feel understood, and begin moving forward with greater clarity, purpose, and direction.