Question: Who is the rare adult male American Opera singer who is able to sing as a sopranist?

Context paragraphs:
Wakashū: Wakashū (Japanese: 若衆 , "young person", although never used for girls) is a historical Japanese term indicating an adolescent boy; more specifically, a boy between the ages at which his head was partially shaven ("maegami") (about 5–10 years of age), at which point a boy exited early childhood and could begin formal education, apprenticeship, or employment outside the home, and the "genpuku" coming of age ceremony (mid-teens through early 20s), which marked the transition to adulthood.  During this period, the "wakashū" wore a distinctive hairstyle, with a small shaved portion at the crown of the head and long forelocks at front and sides, and typically wore kimono with open sleeves ("wakiake"); boys from wealthier families could wear "furisode".  After the coming of age ceremony, the forelocks were shaved off, giving the adult male hairstyle ("chonmage"), and the boy assumed the adult male style of kimono with rounded sleeves.  Although any person would be clearly classified as a child, "wakashū" or adult, the timing of both boundaries of the "wakashū" period were relatively flexible, giving families and patrons the ability to accommodate the development and circumstances of the individual boy.

Michael Maniaci: Michael Maniaci (born in 1976 May 3) is an American opera singer.  Possessing a male soprano voice, Maniaci is noted for his claim to be able to sing into the upper soprano register without using falsetto, an otherwise common phonation for men who sing in high registers, such as countertenors. Although this was possible for castrati, because of the hormonal imbalance following castration, Maniaci claims that, for some unknown reason, his larynx did not develop and lengthen completely, causing his voice not to "break" in the usual manner.  Maniaci claims that this physical particularity has given him the ability to sing in the soprano register without sounding like a typical countertenor or a female singer.  There are, however, critics who claim that Maniaci actually sings in falsetto.

Adam Klein (tenor): Adam Charles Josef Klein (born January 22, 1960) is an American opera singer who has sung leading tenor roles with many North American opera companies including, the Metropolitan Opera, Seattle Opera, Edmonton Opera, and New York City Opera.

American alligator: The American alligator ("Alligator mississippiensis"), sometimes referred to colloquially as a gator or common alligator, is a large crocodilian reptile endemic to the southeastern United States.  It is one of two living species in the genus "Alligator" within the family Alligatoridae; it is larger than the other extant alligator species, the Chinese alligator.  Adult male American alligators measure 3.4 to in length, and can weigh up to 453 to 600 kg .  Females are smaller, measuring around 3 m .  The American alligator inhabits freshwater wetlands, such as marshes and cypress swamps from Texas to North Carolina.  It is distinguished from the sympatric American crocodile by its broader snout, with overlapping jaws and darker coloration, and is less tolerant of saltwater but more tolerant of cooler climates than the American crocodile, which is found only in tropical climates.

Sopranist: A sopranist (also, sopranista or male soprano) is a male singer who is able to sing in the vocal tessitura of a soprano usually through the use of falsetto vocal production.  This voice type is a specific kind of countertenor.  In rare cases an adult man may be able to sing in the soprano range using his normal or modal voice and not falsetto due to endocrinological reasons, like Radu Marian, or as a result of a larynx that has not completely developed as in the case of Michael Maniaci.

Man (word): The term "man" (from Proto-Germanic "*mannaz" or "*manwaz" "man, person") and words derived from it can designate any or even all of the human race regardless of their sex or age.  The word developed into Old English "man, mann" meaning primarily "adult male human" but secondarily capable of designating a person of unspecified gender, "someone, one" or humanity at large (see also Old Norse "maðr", Gothic "manna" "man").  More restricted English terms for an adult male were "wer" (cognate: Latin "vir"; survives as the first element in "werewolf") and "guma" (cognate: Latin "homo"; survives as the second element in "bridegroom").

Dodge Correctional Institution: Dodge Correctional Institution, (DCI), is an adult male maximum-security correctional facility operated by the Wisconsin Department of Corrections Division of Adult Institutions in Waupun, Wisconsin.  The facility was converted from the Central State Hospital for the Criminally Insane to an adult correctional facility in 1977 at a cost of $2.47 million of general obligation bonds, as authorized by Chapter 29 of the Laws of 1977.  The first two inmates were transferred from the nearby Waupun Correctional Institution to DCI on May 15, 1978.  On October 29, 1993, ground was broken for a $45 million expansion which more than doubled the size of the facility.  On June 17, 1996, the first female was admitted to DCI making it the only reception center for both male and female adult felons committed to the Wisconsin Department of Corrections.  DCI served as the reception center for both males and females until December 1, 2004, when the female reception center moved to the Taycheedah Correctional Institution.  DCI also serves as the central medical center for the division, providing both in-patient and out-patient care for male and female inmates.

Green Bay Correctional Institution: Green Bay Correctional Institution (GBCI) is an adult male maximum-security correctional facility operated by the Wisconsin Department of Corrections Division of Adult Institutions in Allouez, Wisconsin.  The prison is located along the east bank of the Fox River.  The prison was originally known as the Wisconsin State Reformatory (WSR).  In 1972, WSR became an adult male, maximum-security prison.  The name was changed to the Green Bay Correctional Institution (GBCI) on July 1, 1979.

Anna Steiger: Anna Justine Steiger (born 13 February 1960) is an American opera singer who has sung leading soprano and mezzo-soprano roles in British, European and North American opera houses.  She has sung many recitals at festivals which have been broadcast live on the BBC, Radio France and the Australian Broadcasting Corporation to name a few.  In 2010, she was invited to participate in the Australian Chamber Music Festival.  She is still active as a recitalist and opera singer.

Southern elephant seal: The southern elephant seal ("Mirounga leonina") is one of the two species of elephant seals.  It is both the largest living pinniped and member of the order Carnivora, as well as the largest marine mammal after the cetaceans.  It gets its name from its great size and the large proboscis of the adult male, which is used to make extraordinarily loud roaring noises, especially during the mating season.  About 40 percent heavier than the male northern elephant seal ("Mirounga angustirostris") and more than twice as heavy as the male walrus ("Odobenus rosmarus"), the bull southern elephant seal is without rival the largest carnivoran alive.  An average adult male southern elephant seal weighs six to seven times more than the largest terrestrial carnivorans, the polar bear ("Ursus maritimus") and Kodiak bear ("Ursus arctos middendorffi").  Additionally, it rivals the extinct giant walrus "Pontolis", whose estimated weight in life was similar, as the largest carnivoran ever known.

Supporting paragraphs: Michael Maniaci Sopranist
Answer: Michael Maniaci