Patron saint of professional excellence? Professional excellence and holiness? Are there saints that were excellent at performing their duties as professionals? Of course, there can be legends that Saint Joseph was perfect master, but there is no evidence of his dedication, skills and mindset that can be role-model for following. I feel that professional excellence and mastery is the hardest achievement that one can make and the ultimate virtue that benefit the others. Why the notion of holiness is so silent about it? Why we can not hear about professionals-saints?
Before going on, lets look at what Wikipedia has to say about saints:


  A saint is a person who is recognized as having an exceptional degree of holiness or likeness or closeness to God. However, the use of the term "saint" depends on the context and denomination. In Roman Catholic, Eastern Orthodox, Anglican, Oriental Orthodox, and Lutheran doctrine, all of their faithful deceased in Heaven are considered to be saints, but some are considered worthy of greater honor or emulation; official ecclesiastical recognition, and consequently veneration, is given to some saints through the process of canonization in the Catholic Church or glorification in the Eastern Orthodox Church.


And now for Wikipedia on what is a patron saint:


  A patron saint, patroness saint, patron hallow or heavenly protector is a saint who in Roman Catholicism, Anglicanism or Eastern Orthodoxy, is regarded as the heavenly advocate of a nation, place, craft, activity, class, clan, family or person. 


Although the above definitions are somewhat generic, they do allow us the ability to resolve the problem of a patron saint of professionalism and holiness.

First of all there is no particular patron saint for genuine holiness because that is one of the things that all patron saints are occupied with for those under their protection. Thus our names day saint is very concerned with our true holiness before God.


  A name day is a tradition in some countries in Europe, Latin America, and Roman Catholic and Eastern Orthodox countries in general. It consists of celebrating a day of the year that is associated with one's given name. The celebration is similar to a birthday. 
  
  The custom originated with the Christian calendar of saints: believers named after a saint would celebrate that saint's feast day, or in the Eastern Orthodox tradition, the day of a saint's death. Name days have greater resonance in the Catholic and Orthodox parts of Europe; Protestant churches practice less veneration of saints. In many countries, however, name-day celebrations no longer have connection to explicitly Christian traditions.


Patron saints can be named for various professional trades and these particular saints should be invoked that we may execute our duties with professionalism and holiness. Thus a patron saint for professionalism excellence and holiness do not exist.

But let us  not stop here. We are always free to take on a new patron saint unto ourselves due to some particular devotion or incident in our lives.

It is in this sense that many have taken to have a devotion to St. Saint Therese of  Lisieux, "The Little Flower". 


  The world came to know Therese through her autobiography, "Story of a Soul". She described her life as a "little way of spiritual childhood." She lived each day with an unshakable confidence in God's love. "What matters in life," she wrote, "is not great deeds, but great love." Therese lived and taught a spirituality of attending to everyone and everything well and with love. She believed that just as a child becomes enamored with what is before her, we should also have a childlike focus and totally attentive love. Therese's spirituality is of doing the ordinary, with extraordinary love.
  
  Her inspiration and powerful presence from heaven touched many people very quickly. She was canonized by Pope Pius XI on May 17, 1925. Had she lived, she would have been only 52 years old when she was declared a Saint.
  
  "My mission - to make God loved - will begin after my death," she said. "I will spend my heaven doing good on earth. I will let fall a shower of roses." Roses have been described and experienced as Saint Therese's signature. Countless millions have been touched by her intercession and imitate her "little way." She has been acclaimed "the greatest saint of modern times." In 1997, Pope John Paul II declared St. Therese a Doctor of the Church - the only Doctor of his pontificate - in tribute to the powerful way her spirituality has influenced people all over the world. - Saint Therese, "The Little Flower"


But, then depending on how one view's things, St. Expeditus who is the patron saint of speedy cases, emergencies, expeditious solutions, against procrastination, merchants and navigators may fit better for you. 

Or perhaps St. Maximilian Maria Kolbe who is the patron saint of families, imprisoned people, journalists, political prisoners, prisoners, pro-life movement, Esperantists, Militia Immaculatae and as Pope St. John Paul II declared of him: "The Patron Saint of Our Difficult Century".