Haley  Mazzarella

Haley Mazzarella

Psychologist, PsyD Specialties Insurance & Fees Locations
Massachusetts Not Accepting Online
Cambridge Accepting In-person

I currently have two in-person slots available: Monday at 1pm and Wednesday at noon. I look forward to hearing from you!

Updated January 29, 2024

Specialties & Expertise

  • Depression
  • LGBTQIA topics
  • Eating disorders
  • Trauma
  • Post-traumatic Stress Disorder (PTSD)
  • Non-traditional relationships (e.g. polyamory)
  • Sex-positive therapy

Professional statement

Dr. Haley Mazzarella is a Clinical Psychologist in Cambridge, MA who specializes in working with the LGBTQQIA+ community, depression, anxiety, PTSD, sexual abuse, developmental trauma, and individuals who are in recovery from eating disorders. She also has extensive experience working with college students, individuals in non-monogamous relationships, and members of the kink community. Dr. Mazzarella primarily offers long-term psychotherapy.

Dr. Mazzarella is a humanistic, relational psychologist who believes in an equal partnership with her clients in the healing process. She has a psychodynamic orientation, which means that she believes that experiences and patterns of behavior in a client’s past affect who they are now. She will incorporate elements of Cognitive Behavioral Therapy (CBT) to help her clients gain a better understanding of fear and anxiety cycles. She will also utilize mindfulness practices to help clients understand and soothe difficult emotions in healthy, sustainable ways. For clients who need to expand their treatment team, she helps them connect with other healthcare providers.

When working with individuals in recovery from an eating disorder, Dr. Mazzarella utilizes psychodynamic therapy in sessions, while also coordinating treatment with clients' existing healthcare support systems, including registered dietitians, PCP's, and psychiatrists. Working with a support team of providers allows the client the space in therapy sessions to focus on the processing of past experiences and current emotional needs and the development of new coping strategies and a new relationship to the self, food, and body image.

Dr. Mazzarella wants her clients to live lives that are healthy, centered, and that reflect their unique selves. She welcomes working with people from all cultural and religious backgrounds. Her office is located between MIT and Harvard.

Message to clients

Sometimes we need help resolving painful and difficult experiences, strengthening our emotional muscles, and finding new paths in our lives. I am dedicated to helping people live their lives in a way that best reflects and supports who they are and who they want to be. I consider it a special trust to listen—as an unbiased third party—and help others process their thoughts, feelings, and experiences so that they can move forward.
As a therapist, I use my training in clinical psychology and my capacity to hold and carefully consider the complexities of life’s challenges to help people see themselves and their choices in new ways. My orientation is a good match if you are looking for long-term, transformational change. I look forward to helping you on your path!


Depression - Providing support and promoting healing of hopelessness, low motivation and energy, sadness, irritability, sleep disturbance, and loss of interest and pleasure in life

LGBTQIA topics - Exploring topics of sexuality, gender, and identity; coping with discrimination and oppression; navigating relationship, family, and cultural challenges

Eating disorders - Reducing unhealthy eating patterns, beliefs, and behaviors, such as restricting, purging, and binging; healing the emotional pain surrounding disordered eating

Trauma - Coping and healing after threatening or scary events, such as witnessing accidents or experiencing sexual, verbal, emotional, or physical abuse

Post-traumatic Stress Disorder (PTSD) - Healing painful experiences and memories from the past

Non-traditional relationships (e.g. polyamory) - Navigating the challenges of being in more than one or multiple romantic relationship

Sex-positive therapy - Exploring reasons behind difficulty building and maintaining close interpersonal relationships or avoiding feelings of vulnerability within one's close relationships through sex-positive lenses


  • Adults (24+)
  • Seniors (65+)
  • Teenagers (13-18)
  • Young adults (18-24)


Haley Mazzarella is not in-network with any insurances.

Read about the benefits of seeing an out-of-network provider here.

Out-of-pocket fees

  • Individual sessions: $200 (45min)
  • Initial session: $250 (60min)
  • Follow-up Intake Sessions (up to two): $250 (60min)

Additional session information

Out-of-network billing options

This provider can support you in getting reimbursement from your insurance company if you are seeking out-of-network reimbursement. Here are the out-of-network billing options they provide:

  • Super billing
Payment options
  • Cash
  • Check
  • Credit Card
  • Debit Card
Session frequency

Frequency of sessions this provider offers to see clients once you are an established client.

  • Weekly
  • As needed


Cambridge practice
126 Prospect Street, #2, Cambridge, Massachusetts 02139
Accepting new clients in-person
Currently Available Times
  • Morning (Before 10am)
  • Daytime (10am - 1pm)
  • Afternoon (1pm - 5pm)
  • Evening (After 5pm)
  • Weekends
Regular Hours
  • Mon 11:00am-4:00pm
  • Tue 11:00am-4:00pm
  • Wed 12:00pm-5:00pm
  • Thu 11:00am-4:00pm
  • Fri 11:00am-1:00pm
  • Sat Closed
  • Sun Closed

Online Sessions (Massachusetts)
Not accepting new clients online
Currently Available Times
  • Morning (Before 10am)
  • Daytime (10am - 1pm)
  • Afternoon (1pm - 5pm)
  • Evening (After 5pm)
  • Weekends
Regular Hours
  • Mon 11:00am-4:00pm
  • Tue 11:00am-4:00pm
  • Wed 12:00pm-5:00pm
  • Thu 11:00am-4:00pm
  • Fri 11:00am-1:00pm
  • Sat Closed
  • Sun Closed

Work and Education

Years of Experience: 10 years

Private Practice, 2017 - Present
Boston Institute for Psychotherapy, 2012 - 2015

William James College, PsyD, 2014
University of Virginia, BA, 2001


Massachusetts: 10484