Question: Who proclaimed that the author of the play "The Twelve Months" was the founder of Russia's children's literature?

Context paragraphs:
Macedonian months: The Macedonian language has two sets of names of the months of the Gregorian calendar.  The most commonly used set of names is derived from the Latin month names and these are used by the vast majority of the Macedonian population.  However, there is also a set of older names for the twelve months of Slavic origin that differ from the Latin month names, although their usage is archaized and largely restricted to folk literature and religious calendars issued by the Macedonian Orthodox Church.

Conscription in Turkey: In Turkey, compulsory military service applies to all male citizens from twenty to forty-one years of age.  Those who are engaged in higher education or vocational training programs prior to their military drafting are allowed to delay service until they have completed the programs or reach a certain age.  The duration of the basic military service varies: for those without 4-year university degrees twelve months as privates; for those with 4-year university degrees or higher either twelve months as reserve officers or six months as short-term privates.

An Account of Corsica: An Account of Corsica is the earliest piece of writing related to the Grand Tour literature that was written by the Scottish author James Boswell.  Its first and second editions were published in 1768, with a third edition within twelve months.  The full title given to the journal is "An account of Corsica, the journal of a tour to that island and memoirs of Pascal Paoli".

Samuil Marshak: Samuil Yakovlevich Marshak (alternative spelling: Samuil Yakovlevich Marchak) (; 3 November [O.S. 22 October] 1887 4 July 1964) was a Russian Jewish and Soviet writer, translator and children's poet.  He translated the sonnets and some other of the works of William Shakespeare, English poetry (including poems for children), and poetry from other languages.  Maxim Gorky proclaimed Marshak to be "the founder of Russia's (Soviet) children's literature."

Agricultural Children Act: The Agricultural Children Act was an Act of Parliament passed by the United Kingdom Parliament in 1873, which prohibited the agricultural employment of children under the age of eight and also provided for the education of children involved in farm labour.  As part of this, the Act stated that children could not be employed in agricultural work without parental confirmation that they had attended school a certain number of times in the preceding twelve months, specifically 250 times for children aged eight to ten and 150 times for individuals over the age of ten.  Ultimately, the Act was ineffective, and its provisions were replaced by those of the Elementary Education Act 1876 and the Elementary Education Act 1880.

Mayor of Derby: Names of the Mayors for the Borough of Derby from the first that was chosen on 3 July 1638 by the king's charter then granted to the town.  The two last bailiffs were the two first mayors, Mr Mellor being proclaimed 3 July 1638 to be the mayor until Michaelmas and twelve months after but he died on 5 February 1639 and Mr Hope served the year out.

The Twelve Months (1956 film): The Twelve Months (Russian: Двенадцать месяцев ; "Dvenadtsat mesyatsev") is a 1956 Soviet traditionally animated feature film directed by the "patriarch of Russian animation", Ivan Ivanov-Vano.  It was produced at the Soyuzmultfilm studio in Moscow and is based on the fairy-tale play of the same name by Samuil Marshak.

Muisca calendar: The Muisca calendar was a lunisolar calendar used by the Muisca.  The calendar was composed of a complex combination of months and three types of years were used; rural years (according to Pedro Simón, Chibcha: "chocan"), holy years (Duquesne, Spanish: "acrótomo"), and common years (Duquesne, Chibcha: "zocam").  Each month consisted of thirty days and the common year of twenty months, as twenty was the 'perfect' number of the Muisca, representing the total of extremeties; fingers and toes.  The rural year usually contained twelve months, but one leap month was added.  This month (Spanish: "mes sordo"; "deaf month") represented a month of rest.  The holy year completed the full cycle with 37 months.

List of Turner Prize winners and nominees: The Turner Prize is an annual prize presented to a British visual artist, organised by the Tate Gallery.  Named after the painter J. M. W. Turner, it was first presented in 1984, and is one of the United Kingdom's most prestigious, but controversial, art awards.  Initially, the prize was awarded to the individual who had "made the greatest contribution to art in Britain in the previous twelve months", but it now celebrates "a British artist under fifty for an outstanding exhibition or other presentation of their work in the twelve months preceding".  The winner is chosen by a panel of four independent judges invited by the Tate and chaired by the director of Tate Britain.  The prize is accompanied by a monetary award of £25,000, although the amount has varied depending on the sponsor.  For example, between 2004 and 2007, while sponsored by Gordon's, the total prize fund was £40,000; £25,000 was awarded to the winner and £5,000 to the losing nominees.

Frank Caplan: Frank Caplan (June 10, 1911 – September 28, 1988) was a youth worker, educator, folk toy collector, and pioneer in developing and manufacturing educational toys for children.  He co-founded Creative Playthings in 1945 with his wife Theresa, and worked with artists, architects, and designers, such as Isamu Noguchi, Louis Kahn, Henry Moore, Robert Winston, and the Swiss toymaker, Antonio Vitali, to create innovative educational play objects and playground designs for children.  By the 1950s, Creative Playthings had gained international recognition and expanded to become one of the most important manufacturers and suppliers of materials for early childhood education.  In 1975, Frank Caplan founded The Princeton Center for Infancy and Early Childhood.  He researched and co-authored a national bestselling series on early childhood development with Theresa Caplan, which included, "The First Twelve Months of Life" (1977), "The Second Twelve Months of Life" (1978), and "The Early Childhood Years: The 2 to 6 Year Old" (1983).  Together they also co-authored "The Power of Play" (1973).  He was one of the first male nursery school teachers in the U.S. and together with Theresa Caplan collected over 50,000 American and international folk toys, folk art, and contemporary playthings, which in 1984 the couple donated to The Children's Museum of Indianapolis for a permanent gallery on folk, fantasy, and play.

Supporting paragraphs: The Twelve Months (1956 film) Samuil Marshak
Answer: Maxim Gorky