Question: The actress who played Clementine Churchill in "The Crown"  joined the board of advisors for a theatre company began by who?

<P0-S0> Dame Harriet Mary Walter, {'1': ", '2': ", '3': ", '4': "} (born 24 September 1950) is an English stage and screen actress. <P0-S1>  Her film appearances include "Sense and Sensibility" (1995), "The Governess" (1998), "Villa des Roses" (2002), "Atonement" (2007) and "Man Up" (2015). <P0-S2>  On television she starred opposite John Lithgow as Clementine Churchill in "The Crown" (2016), Natalie Chandler in the ITV drama series "" (2009–14), and as Lady Prudence Shackleton in four episodes of "Downton Abbey" (2013–15). <P0-S3>  She was appointed Dame Commander of the Order of the British Empire (DBE) in 2011 for services to drama. <SEP> <P1-S0> The brainchild of Paula D'Alessandris, Mind The Gap (MTG) Theatre Company was conceived in 1998 to import edgy British productions, readings and workshops to New York audiences and, in return, export some of America's unknown theatrical talent to the United Kingdom. <P1-S1>  Featuring An Anglo-American repertory company of actors and writers, the New York City-based company maintains active ties to an assortment of British theatre agencies and has a literary staff that reads hundreds of new scripts each year. <P1-S2>  In 2001, Dame Helen Mirren and Dame Judi Dench joined MTG’s Board of Advisors. <P1-S3>  In 2013 Dame Harriet Walter joined the board. <SEP> <P2-S0> Margot Hartman Tenney is the chairman of the board of the First Stamford Corporation, one of the largest privately held commercial real estate companies in the State of Connecticut. <P2-S1>  Born and raised in New York City, she started her professional career as an actress at the Arena Stage Company in Washington, D.C.. <P2-S2>  After years of working in the regional theatre, Margot founded the Hartman Theatre Company in Stamford, Connecticut. <P2-S3>  For over a decade the Hartman Theatre Company served as one of the nation’s leading regional theatres and was the recipient of a special Drama Desk Award for Producing Unprecedented Work, such as the pre-Broadway production of The Runner Stumbles in the theatre’s premiere season. <P2-S4>  Through the creation of the Dorothy and Jesse Hartman Foundation, Margot supports several not for profit institutions such as the Palm Beach Shakespeare Festival. <P2-S5>  She also served on the board of directors for the Eugene O’Neill Theatre Center, The Helen Hayes Theatre in Nyack, New York and the Musical Theatre Works Company in New York. <P2-S6>  Margot received the Lifetime Achievement Award for the Advancement of Women from the Connecticut United Nations Associations. <P2-S7>  Margot was also presented with an Outstanding Connecticut Woman Award by Governor O’Neill in the State Senator Chamber and thanked by the United States Senator Christopher Dodd for her service to the State. <SEP> <P3-S0> UBI Theatre Leipzig is a bilingual (English and German) theatre company based in Leipzig (Germany). <P3-S1>  Established in Birmingham (England) in 2002, it moved to Leipzig in 2005 along with its founder Gareth Knapman. <P3-S2>  In 2012, German theatre educator and actress Claudia Jessat joined the company and the two of them managed the company together until Gareth's passing in early 2016, after which Claudia assumed the role of the owner. <P3-S3>  The name of the company was then changed from "Ubiquity Theatre Company" to UBI Theatre Leipzig. <P3-S4>  UBI seeks to produce socially conscious theatre projects in both performance and in workshop projects with children, youngsters and adults. <P3-S5>  UBI follows the British tradition of 'Theatre in Education' and 'Community Theatre', and is influenced by Bertolt Brecht, Keith Johnstone and Augusto Boal in its ideals of using theatre for social gain. <P3-S6>  Projects take place in their Leipzig premises and various local theatres.