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Kenneth J. Zucker is an American psychologist and sexologist, and head of the child and adolescent gender identity clinic at Toronto's Centre for Addiction and Mental Health. Based on his collaboration with Susan Bradley, Zucker is considered an international authority in the field of gender identity disorder in children (GIDC) and in adolescents. According to Xtra!, "his clinic has probably diagnosed more GIDC than any other facility in the world."
Zucker is also a Professor with the Departments of Psychiatry and Psychology at the University of Toronto. He was named editor-in-chief of Archives of Sexual Behavior in 2001. In 2007 Zucker was chosen to be a member of the American Psychological Association Task Force on Gender Identity, Gender Variance, and Intersex Conditions, and in 2008 was named chair of the American Psychiatric Association workgroup on "Sexual and Gender Identity Disorders" for the 2012 edition of the DSM-5. He previously served on workgroups for the DSM-IV and the DSM-IV-TR.
Zucker was born in New York. Zucker received his B.A. from Southern Illinois University, his M.A. from Roosevelt University, and his Ph.D. from University of Toronto in 1982. He holds a C. Psych. certification.
Zucker's graduate work in developmental psychology resulted in his master's thesis on normative gender identity development in children. While in graduate school, Zucker met his future collaborator Susan J. Bradley, a child psychiatrist on staff at the Child and Adolescent Service (now the Child and Family Studies Centre) at the Centre for Addiction and Mental Health (then, the Clarke Institute of Psychiatry), a public mental health centre and a teaching hospital of the University of Toronto Faculty of Medicine.
According to his biography, "Zucker's awe of the imposing Clarke Institute edifice inspired him to meet with the then chief of psychology, Dr. Kingsley Ferguson", who told Zucker of Bradley's new working group to assess children and adolescents with gender identity problems. Zucker had read Richard Green's 1974 book Sexual Identity Conflict in Children and Adults and was convinced to join Bradley's group.
Therapeutic intervention for gender variance
Since the mid-1970s Zucker has treated about 500 preadolescent gender-variant children to "help these kids be more content in their biological gender" until they are older and can determine their sexual identity. For children assigned as males at birth, Zucker asks parents to take away their child's "feminine" toys and instruct the child not to play with or draw pictures of girls. Psychologist Darryl Hill describes Zucker's approach to gender-variant children:
Zucker and Bradley believe that reparative treatments (encouraging the child to accept their natal sex and associated gender) can be therapeutic for several reasons. They believe that treatment can reduce social ostracism by helping gender non-conforming children mix more readily with same sex peers and prevent long-term psychopathological development (i.e., it is easier to change a child than a society intolerant of gender diversity). Reparative therapy is believed to reduce the chances of adult GID (i.e., transsexualism) which Zucker and Bradley characterize as undesirable.
Zucker is at odds with gay and transgender groups, but distances himself from organizations that share this distinction. Zucker believes that failing to control a child's gender expression at a young age and seek early counseling for transgendered behavior can be considered "some type of emotional neglect." He claims some parents may have been swayed by an activist transsexual agenda and "cement...in more and more" behaviors that may not result from transsexualism. Instead Zucker advises such children work through their hatred of their bodies before being accepted as transsexuals.
Zucker supports the early intervention of children with ambiguous genitalia to be assigned and reared as female, or more generally as "the gender that carries the best prognosis for good reproductive function, good sexual function, normal-looking external genitalia and physical appearance, and a stable gender identity." He published results of two patients who were male by birth but suffered ablatio penis and were shortly thereafter reassigned as females. At age 26 both denied ever feeling the desire to be male. Both patients reported more masculine behaviors and bisexuality, about which Zucker suspects that gender role and sexual orientation develop mostly before birth while gender identity development begins shortly after birth.
Zucker says parents set the goals at his clinic. "We recommend that one goal be to help the child feel more secure about his or her actual gender, another to deal with the child's emotional difficulties, and a third to help with problems in the family. It's helpful to have parents set limits on things like cross-dressing, which many parents have not done before coming to us." Zucker's follow-up of 50 treated children found that "about 10 percent are still very unhappy about their gender, still cross-dressing, and thinking about having sex reassignment surgery" as young adults. Zucker has stated that "the therapist must rely on the 'clinical wisdom' that has accumulated and to utilize largely untested case formulation conceptual models to inform treatment approaches and decisions."
Zucker coauthored a statistical report with J. Michael Bailey that found gays and lesbians exhibited more cross-gender activity as children. Bailey claims Zucker considers transsexualism a "bad outcome" for these children, specifically citing the risks and hassle of sex change operations.
For adolescent clients expressing gender identity disorder, Zucker's treatment protocol resembles that for adult GID, consisting of hormone replacement therapy to aid the adolescent in a social transition. Since sex reassignment surgery is not generally performed on minors in North America, Zucker's clinic does not provide recommendations for it – instead, clients are encouraged to pursue reassignment through the adult Gender Identity Clinic at CAMH, which controls funding for the procedure in Ontario.
Controversy over reparative therapy for transgender children
As an editor of Archives of Sexual Behavior, Zucker published a controversial study on gay "reparative therapy" by Dr. Robert Spitzer, which the author later disavowed:
Yet, heavily invested after all the work, [Spitzer] turned to a friend and former collaborator, Dr. Kenneth J. Zucker, psychologist in chief at the Center for Addiction and Mental Health in Toronto and editor of the Archives of Sexual Behavior, another influential journal. “I knew Bob and the quality of his work, and I agreed to publish it,” Dr. Zucker said in an interview last week. The paper did not go through the usual peer-review process, in which unnamed experts critique a manuscript before publication. “But I told him I would do it only if I also published commentaries” of response from other scientists to accompany the study, Dr. Zucker said.
The Gay and Lesbian Medical Association believes "'reparative' therapy that seeks to reverse sexual orientation or gender identification" is an "extreme example" of bias that "may lead to increased self hatred and mental health problems."  Clinicians have cited similarities between Zucker's therapeutic intervention and reparative therapy for homosexuals. However, Bradley and Zucker respond that prevention of homosexuality was never a goal in their treatments and cite a lack of empirical evidence for the most effective approach. Journalist Marc Lostracco described Zucker's therapy as "well-meaning" but "problematic and harsh.",. Others, like author Phyllis Burke, object to any diagnosis of GID in children, considering it to be "child abuse."  Zucker dismisses Burke's book as "simplistic" and "not particularly illuminating;" journalist Stephanie Wilkinson said Zucker characterized Burke's book as "the work of a journalist whose views shouldn't be put into the same camp as those of scientists like Richard Green or himself."
LGBT activists protested Zucker's 2008 appointment to the DSM-5 working group. The National Gay and Lesbian Task Force issued a statement questioning the APA's decision to appoint Zucker and a second member of the work panel. According to a response released by American Psychiatric Association, Zucker does not advocate reparative therapy for transgender adults or for trans youth in all cases, and he opposes change therapy for gays under all circumstances.
- Gender identity disorder and psychosexual problems in children and adolescents, 1996, Guilford Press, ISBN 978-0-89862-266-9 [Amazon-US | Amazon-UK], with Susan J Bradley
- Ex-gay research: analyzing the Spitzer study and its relation to science, religion, politics, and culture, 2006, Harrington Park Press, ISBN 978-1-56023-557-6 [Amazon-US | Amazon-UK], coedited with Jack Drescher
- Dingfelder, Sadie F. (April 2004). "Gender bender". Monitor on Psychology, Vol. 35, No. 4. Retrieved 2008-06-17.
- Awad G.A. (April 1, 1999). Gender Identity Disorder and the Psychosexual Problems in Children and Adolescents (review) American Journal of Psychotherapy
- Morton, Gillian (January 11, 2001). Drop the doll! Xtra
- Bradley S.J., Blanchard R, Coates SW, Green R, Levine SB, Meyer-Bahlburg HFL, Pauly IB, Zucker KJ (1991). Interim report of the DSM-IV Subcommittee on Gender Identity Disorders. Archives of Sexual Behavior Volume 20, Number 4 / August, 1991
- Wilkinson, Stephanie (2001). Drop the Barbie! Brain, Child
- Zucker, Kenneth J. and Susan J. Bradley (1995). Gender Identity Disorder and Psychosexual Problems in Children and Adolescents. Guilford Press ISBN 0-89862-266-2 [Amazon-US | Amazon-UK]
- Brown, Patricia Leigh (December 2, 2006). Supporting Boys or Girls When the Line Isn’t Clear. New York Times
- Spiegel, Alix (May 7, 2008). Two families grapple with sons' gender preferences. All Things Considered, National Public Radio
- Hill D.B., Rozanski C., Carfagnini J., Willoughby B. (2006). Gender Identity Disorders in Childhood and Adolescence: A Critical Inquiry. pp. 7–34. In Karasic D, Drescher J (Eds.) Sexual and Gender Diagnoses of the Diagnostic and Statistical Manual (DSM): A Reevaluation. Haworth Press ISBN 0-7890-3214-7 [Amazon-US | Amazon-UK]
- SJ, Bradley; Oliver GD, Chernick AB, Zucker KJ (July 1998). "Experiment of Nurture: Ablatio Penis at 2 Months, Sex Reassignment at 7 Months, and a Psychosexual Follow-up in Young Adulthood". Pediatrics 102 (1): e9. PMID 9651461.
- Goleman, Daniel (March 22, 1994). The 'Wrong' Sex: A New Definition Of Childhood Pain. New York Times
- Zucker K.J. (2008). Children with gender identity disorder: Is there a best practice? Neuropsychiatrie de l'Enfance et de l'Adolescence. Volume 56, Issue 6, September 2008, Pages 358-364
- Bailey J.M., Zucker K.J. (1995). Childhood Sex-Typed Behavior and Sexual Orientation: A Conceptual Analysis and Quantitative Review. Developmental Psychology, v31 n1 p. 43–55 Jan 1995
- Bailey, J. Michael (2003). The Man Who Would Be Queen: The Science of Gender-Bending and Transsexualism. Joseph Henry Press, ISBN 978-0-309-08418-5 [Amazon-US | Amazon-UK]
- Carey, Benedict (18). "Psychiatry Giant Sorry for Backing Gay ‘Cure’". The New York Times. Retrieved 12 August 2012.
- Dean, Laura, Ilan H. Meyer, Kevin Robinson, Randall L. Sell, Robert Sember, Vincent M.B. Silenzio, Daniel Wolfe (2000). Lesbian, gay, bisexual, and transgender health: Findings and concerns. Journal of the Gay and Lesbian Medical Association, 2000.
- Ryan, C, Bradford, J & Honnold, J. (1999) Social workers' and counselors' knowledge and understanding of lesbians. Journal of Lesbian and Gay Social Services, 9(4):1–26.
- Pickstone-Taylor, Simon D. (2003). Children with gender nonconformity. Journal of the American Academy of Child and Adolescent Psychiatry, 42, 266.
- Bradley, Susan J.; Zucker, Kenneth J. (1 March 2003). "CHILDREN WITH GENDER NONCONFORMITY". Journal of the American Academy of Child & Adolescent Psychiatry 42 (3): 266–268. doi:10.1097/00004583-200303000-00004.
- Lostracco, Marc (May 9, 2008). But for today I am a boy. Torontoist
- Burke, Phyllis (1996). Gender Shock. Anchor. ISBN 978-0-385-47718-5 [Amazon-US | Amazon-UK]
- Chibarro, Lou Jr. (May 30, 2008). Activists alarmed over APA: Head of psychiatry panel favors 'change' therapy for some trans teens. Washington Blade
- Rau, Krishna (July 7, 2008). Trans activists infuriated by doctors in charge of gender identity definitions. Xtra
- National Gay and Lesbian Task Force. "Task Force questions critical appointments to APA’s Committee on Sexual and Gender Identity Disorders". Retrieved 13 August 2012.
- "Statement on Dr. Kenneth Zucker and Gender Identity Disorder". 23. Retrieved 13 August 2012.
- "Web of Science". 2008. Retrieved 2008-07-01