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1701 E. Woodfield Road,Suite 905,
Schaumburg, IL 60173
PH: (847) 797-4699

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(224)457-4359 

Mariana joined our team in July of 2023 and has been a great addition to our wonderful team! She sees adolescent and adult patients and offers services in both English and Spanish. Mariana is a recent graduate who earned her BA in psychology at SIU Carbondale and went on to earn her Master's degree at The Chicago School of Professional Psychology with a concentration in Latinx Mental Health. Mariana recently completed her internship at El Circulo. The Circle Resource Center located in Brighton Park where she provided women in the community virtual sessions during the COVID-19 pandemic.

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Education and Expertise

Jon Mathias is a third-year doctoral practicum student in clinical psychology at Adler in Chicago, IL. Jon completed their undergraduate education at Northwestern University where they majored in psychology and minored in creative writing. Jon currently offers individual therapy for patients across the lifespan and works under the supervision of Dr. Montesano and Dr. Guada. As a nonbinary clinician, Jon brings passion and expertise for LGBTQ+ care to Guada Psychological Services and hopes to provide supporting therapies for queer individuals. Jons interests lie in treating mood, anxiety, and attachment disorders, as well as working with adolescents and young adults.

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Lagha Mostajabi is a therapy extern currently pursuing her doctorate in clinical psychology at Adler University. Guided by her strong belief in the collaborative nature of therapy, Lagha sees her clients as experts in their own lives; she sees herself as a supportive partner in their journey towards positive change and personal growth. Drawing from a blend of humanistic and cognitive-behavioral therapy (CBT) modalities, Lagha adopts an integrative and strength-based approach in her practice. Lagha currently provides individual therapy for patients across the lifespan and is under the supervision of Dr. Montesano and Dr. Guada.

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Education and Training

Alissa Tomanek is a therapy extern pursuing her doctorate in clinical psychology at Adler University. Alissa views her clients as the experts of their own lives and perceives therapy as a working alliance between the clinician and the client. She sees her own role as someone to help guide, not someone who needs to instruct.  Drawing from a blend of humanistic and cognitive-behavioral therapy (CBT) therapy approaches, Alissa strives to acknowledge her client's strengths and help them learn to work with their weaknesses. Alissa provides individual therapy for patients across the lifespan and is under the supervision of Dr. Montesano and Dr. Guada.

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Nataly is in the doctoral training program where she will start her psychological assessment practicum. Her current role at Guada Psych is completing neuropsychological assessments on a range of clinical presentations, from personality disorders to autism spectrum disorder. Her love for working with children, adolescents, and families is a main reason she has pursued the clinical psychology doctoral program. Nataly describes herself as highly curious and appreciative of the learning process. She takes a relational approach to her work as she believes that the quality of our life has a lot to do with the quality of our relationships.

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(224) 483-6523

Clarissa began working with Guada Psych in April of 2023 and sees adolescent and adult patients, she is bilingual and offers services in both English and Spanish. Clarissa’s interest in the field began when she witnessed family members experiencing mental health concerns during her teenage years. Clarissa has worked various jobs and positions prior to graduating with her Master’s Degree in Clinical Mental Health Counseling. These positions further solidified her desire to join the field of mental health, a job that is people centered at its foundation. Clarissa is passionate about addressing needs on a personal level; She emphasizes that therapy is a collaborative approach between the clinician and the patient and encourages patient feedback to cater to patients’ unique therapeutic goals. Clarissa favors co-creating therapeutic goals with patients as she uses her skills and expertise to guide patients towards healthy and sustainable change. 

 Kati Guada, PsyD Founder/CEOcontact@This email address is being protected from spambots. You need JavaScript enabled to view it.

I opened Guada Psych Services to fill the gap in quality mental health care that is now available to all people. I am very lucky to have found wonderful people to work alongside in fulfilling this endeavor. I got into mental health because I have always had a strong interest in human behavior and relationships as well as language and social patterns, which are a great fit for the field of clinical psychology. More importantly, though, I have always had compassion for people and the circumstances surrounding their mental health. Guada Psych is a place where all people can come to receive top-notch care by highly skilled professionals who take a patient-centered approach. We offer therapy and diagnostic services in an outpatient setting and are available for individuals ages ten and up.

Liara Montesano, PsyD Clinical Director of TrainingThis email address is being protected from spambots. You need JavaScript enabled to view it.

Dr. Liara Montesano has been practicing at Guada Psych since October of 2019 and has proven to be an invaluable asset to our team. According to Dr. Montesano, "I view human beings as having vast amounts of potential that is often held back by different complications. I chose clinical psychology because of my desire to see individuals become the best versions of themselves." Today, Dr. Montesano works with adult patients in therapy and assessment/evaluation. She is also the clinical director of our training program. Dr. Montesano's patients have often reached out to give feedback regarding how much they appreciate her sharp skill set and warm approach.

 Sarah English, LCPC Staff Professional Counselor and SupervisorThis email address is being protected from spambots. You need JavaScript enabled to view it.

Sarah English has been at Guada Psych since 2017 treating adolescent and adult patients. She is also one of our clinical supervisors. Sarah is an extremely talented mental health provider with a wide range of therapeutic skills that allow her to offer patients a multidisciplinary approach. Sarah works with adolescents and families as well as adults experiencing difficulty maintaining a happy and healthy lifestyle as a result of their mental health. In her own words, "I help individuals and families who have gone through experiences not everyone can understand. I enjoy equipping my patients with targeted skills to help them return to enjoying everyday life. My priority is to build a healthy relationship and rapport that creates a safe and open environment. I build realistic and attainable treatment plans with my patients to bring them relief."

 Joe Serrano, PsyD Staff Psychologist in SchaumburgThis email address is being protected from spambots. You need JavaScript enabled to view it.

Dr. Joe Serrano is a psychologist with over 14 years of varied clinical experiences in community mental health counseling centers, private practices, and inpatient facilities across the Midwest. He is extremely skilled at providing patients a route towards their goals and guiding them along this journey. He works with teens, young and middle-aged adults, and elderly patients.

Stacy Stewart, PhD  in Training SchaumburgThis email address is being protected from spambots. You need JavaScript enabled to view it.

Work Cell: 847-204-9602

Dr. Stacy Stewart is a welcomed addition to our team of highly skilled clinical psychologists. According to Dr. Stewart, we often encounter life events that impact our ability to accurately see, meaningfully regulate, and genuinely believe in ourselves. Dr. Stewart believes that therapy is a collaborative process that assists us in uncovering our truest selves and providing us with tools to live a life aligned with our core values. Dr. Stewart takes a strengths-focused, trauma-informed approach with clients

Stephen Stewart, Psy.D., NCSP This email address is being protected from spambots. You need JavaScript enabled to view it.

Work: 224-833-6076

Dr. Stephen Stewart is a new addition to Guada Psych who brings a wide array of clinical experience spanning over 10 years. Dr. Steve works with clients across the lifespan and has experience working with youth and adults in a variety of settings, including in-patient hospitalization, intensive out-patient, community mental health, school-based, and correctional settings. He enjoys using a client-centered approach where the client is the expert of their own lives and Dr. Steve can help guide them to an attainable and goal-oriented solution.

Jennifer Mazzetti, PsyD Staff Psychologist in SchaumburgThis email address is being protected from spambots. You need JavaScript enabled to view it.

847-989-2313

Dr. Tori Visscher began working with Guada Psych Services in November of 2022 and is a welcomed addition to our diverse team of talented therapists and psychologists! Dr. Visscher is motivated to bring testing services to underserved populations, and she says that she enjoys working as a psychologist because it allows her to help people reach their personal goals and aspirations. Dr. Visscher says, "Finding the right diagnosis can make a world of difference in knowing where to begin with creating change. I enjoy giving recommendations and suggestions that can help create a roadmap for what direction to take in treatment and provide clarity to those who may be struggling with how to manage their experiences." Dr. Visscher performs a range of psychological evaluations, from ADHD rule out to diagnostic clarification. 

 DSC5025 1 1 11zonThis email address is being protected from spambots. You need JavaScript enabled to view it. 

224-833-6078

Dr. Anthony is a post-doctoral fellow at Guada Psychological Services. She received her Bachelor of Science degree in psychology from Xavier University of Louisiana. She earned her education specialist degree and doctorate in school psychology from The Chicago School of Professional Psychology. Dr. Anthony recently completed her pre- doctoral internship at St. Raphael Counseling in Englewood, Colorado.


Guadapsych Staffs

Sam Boothe, Doctoral Student in Training, Assessment Practicum in Schaumburg

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Sam is in one our doctoral students in training, he is currently focused on providing therapy to adolescents and adults. Sam got into the field of psychology because he finds the psychological sciences interesting. He also appreciates human beings and their unique ways of existing in the world and wanted to learn more. Sam is excited to further his knowledge on the brain sciences and is moving swiftly through his assessment externship with ease as he works to master the psychological assessment process-he is definitely a natural!