Thank you, Kamil. Good morning, everyone, and thank you for joining us. I'll start with a brief update on our business highlights and then touch on a few of our clinical development programs. Then I'll hand it off to Stuart Shanler, our Chief Scientific Officer; who will review our clinical development plans and timelines. Jeff Wayne, our Interim Head of Commercial will then address our commercial business, after which Frank Ruffo, our CFO; will review our financial results. Following our prepared remarks, we will open up the line to take your questions. Dr. David Gordon, our Chief Medical Officer, will also be available during the Q&A portion of the call. We are really excited to enter 2019, a year in which we are relaunching RHOFADE and also reporting out a number of important data catalyst across our clinical pipeline. Starting with commercial; in October we acquired worldwide rights to RHOFADE cream, we closed the deal at the end of last November, and in December, our sales team began promoting RHOFADE. I'll start with a few updates on this transaction. First, the transition and integration from Allergan to Aclaris has proceeded smoothly, and they have been a good partner. Second, we recently changed leadership on the commercial side of the business with the appointment of Jeff Wayne as our new Interim Head of Commercial. Jeff brings over 30 years of pharmaceutical experience with a majority spend in dermatology. During his career, he has held positions of increasing responsibility in sales, marketing and general management with Galderma, Intendis, Promius, Onset and LEO Pharma. He launched METROGEL in both, the United States and Canada and was responsible for the marketing of FINACEA in the United States as well. These are two medications prescribed for the treatment of rosacea. In addition, in his role as Vice President of Business Development, he managed the RHOFADE transaction from the beginning, providing a seamless transition of leadership for us. Third, as a result of the RHOFADE acquisition, we have realigned our field force with an emphasis on targeting existing and potential RHOFADE prescribers. And finally, after a successful national sales meeting and AAD meeting in February, we are pleased to announce our sales force is now focused on officially relaunching RHOFADE in the primary detail position. Thus far in the first quarter of 2019 we are encouraged by the early prescription trends as the 4-week IQVIA data for the period ending March 8 indicates that we experienced an 8.4% increase in TRXs or total prescriptions as compared to the prior 4-weeks. NRXs or new prescriptions for the 8-weeks ending March 8 are 16% higher than the NRXs for the 8-weeks immediately before we began promoting RHOFADE. Moving to the fourth quarter results. During the fourth quarter, total net revenue was $3.7 million which consisted of net sales of ESKATA of $750,000, net sales of RHOFADE of $1.1 million which was for December only, and contract research revenue of $1.3 million. While fourth quarter and full year of ESKATA sales were below our expectations, we continue to believe in the long-term potential for the product. Now turning to our pipeline, a few items to note. We have a very busy and exciting year ahead of us and we expect to report results from multiple studies regarding the efficacy and safety of our portfolio of clinical drug candidates for the treatment of common warts, alopecia areata, and our genetic alopecia, atopic dermatitis and vitiligo. Before handing it off to Stu to review regular clinical reporting, I would like to provide a brief update on our eyebrow study that was conducted in Australia, as well as our review of our next clinical candidate, an MK2 inhibitor, known as ATI-450 which is the first compound that is coming out of our confluence acquisition in late 2017. At this time I would ask you to turn to the Slide presentation that we provided. If we turn to Slide 3, this is just a pipeline overview of what we have coming down the pike in 2019; we have a common wart program in Phase III that will readout in the third quarter of this year. We have two alopecia areata trials that will readout in the second and third quarter respectively this year. And then we have three open label studies, androgenetic alopecia, vitiligo and atopic dermatitis that will readout in the second quarter of this year. Next in-line will be the MK2 inhibitor where we will be filing an IND in the second quarter this year and then moving into a series of sad math studies on root to proving out the concept in a cohort of RA patients in 2020. First, an update on the Australian eyebrow study; and I would ask that you turn to Slides 5 through 8. As you may recall, we previously showed pictures and presented data in December of last year. 12 patients were initially recruited in the study and 5 have continued past 6-months on study drug. I'm pleased to provide an update from the ongoing extension phase of the study. Hair regrowth continues in 3 of the 5 patients, and as you can clearly see from a the photos, there has been further improvement over the last three months. The first subject is a 33-year old male who has had alopecia areata since 2009. With a current episode of eyebrow loss being approximately 8 years in duration. As of the end of February this subject has had a little over 8 months of exposure to study drug. In this close up, we can see nice regrowth in the frontal view, and also the ensuing side views in the subsequent slides. It is important to note that the brow-archess [ph] have been re-established and sustained. Turning to 9 throughout 12; this subject is a 23 year old that has been on study drug for approximately 9 months. The 9 months photos for this subjects were also already presented in December, again, we see nice regrowth in the frontal view, and also in the side view, each of the subsequent slide. Now turning to slides 13 through 16; this is a 45-year old female with alopecia areata since 1986. The current duration of areata loss is approximately 5 years prior to entering the study. She has had prior therapy in the past and has been on study drug for approximately 9 months. Here is the frontal view showing nice hair regrowth and re-establishment of the brow arch. Again, looking at the side view close-up, we see valus [ph] and terminal hair regrowth and many white terminal hairs. This subject had demonstrated hair growth at 6-months but has since continued to improve with ongoing therapy and the extension study. This is particularly impressive in our opinion given the long-standing [indiscernible] nature of her disease. We believe these results demonstrate what we have maintained since the beginning of our work in this area that the topical approach with this mechanism is viable. Now why is this important? If you turn to Slide 17, as you may recall, we presented a few slides in December that I would like to briefly touch on again. This is a slide depicting the phenotypic spectrum of hair loss that we tend to see in clinical practice. This is a relatively broad spectrum of hair loss within the overall category of alopecia areata. Severe disease involves complete loss of scalp hair and this is what the oral JAK inhibitor programs, including our own are targeting which you can see in the picture on the bottom of the slide. However, there continues to be an unmet medical need in patients who have lower degrees of hair loss or sole scores [ph], and many of these patients don't even qualify for the ongoing oral JAK inhibitor trials. We simply can't forget about these patients, the disease patients who represent the majority of those suffering from alopecia areata. It is this phenotypic spectrum, the drives that need to be thinking about post oral and topical treatment. Moving to Slide 18 and further to the point about the importance of topical therapy; this is the current treatment paradigm as listed on the National Alopecia Areata Foundation's website. Treatment decisions are often made on the basis of age of the patient and extent of disease, if you are younger, you typically receive various topical options as first line treatment as indicated on the left hand portion of the slide. This is also the case when your extent of disease is less than 50% involvement on the scalp as you can see in the middle. As the extent of disease increases, you're more likely to employ systemic treatments along with topical options or possibly steroid injections. It is interesting to note, that this type of treatment algorithm is typical of most dermatology disorders including acne and psoriasis. This flowchart is extremely useful in informing how we think about the future potential treatment paradigms with JAK inhibitors, both oral and topical. So turning to Slide 19, this is how we think about orals and topicals. As you can see here, younger patients or those with less severe disease will be candidates for topical treatments and this represents the bulk of the prevalent alopecia areata population. Those with more severe disease might use a course of topical treatment to decrease the time on oral therapy or potentially step down to topical treatment after a successful course of oral therapy. As previously announced, patients from our blinded, oral and topical Phase II studies have the opportunity to continue in long-term open-label expansion studies. This program was specifically designed to provide us with the unique dataset allowing us to evaluate induction with either an oral or topical formulation and potential maintenance of the fact with long-term topical therapy. Since these two studies are blinded, we do not have data to share at this time but today we have shared additional data from the previously reported eyebrow study that continue to show the utility of topical therapy with a favorable risk benefit profile in this disease. This is very important since AA is chronic and it's characterized by the need for longer continuous treatment regiments. This is in contrast for diseases such as atopic dermatitis which although chronic tend to be more episodic in nature. As an example, efficacy in atopic dermatitis trials are typically assessed at 1-4 months where ongoing oral JAK inhibitor trials assess efficacy after 6-9 months of treatment on our oral with the recognition the longer term efficacy needs to be assessed beyond that time point. These updates photographs shown in the tree [ph] with our topical JAK inhibitor can lead to hair growth, even in patients with severe and long lasting disease. Many alopecia areata patients will require a chronic therapy and patients can achieve good hair regrowth with a topical treatment route which could limit systemic adverse events. The safety results thus far indicates ATI-502 has been generally well tolerated, and no treatment related serious adverse events have been reported to-date. I would like to finish with a brief mention about our MK2 inhibitor program. Our investigation shown new drug application or IND for ATI-450 is on-track for submission to the FDA for rheumatoid arthritis in mid-2019. In FY19 [ph], we expect to begin a Phase I and Phase II trial in the second half of 2019; this is the first clinical candidate coming from our confluence drug discovery team acquired in 2017. Turning to Slide 21, ATI-450 is an oral compound that targets the production and activity of TNF alpha, IL-1 alpha and beta, and IL-6; these are all cytokine targets of established biologics such as the well-known anti-TNF and anti-IL-1s and anti-IL-6s listed on this slide. If successful, we believe ATI-450 would be a therapeutic with a broad array of both, dermatology and non-dermatology indications. Turning to Slide 22, some of you may be familiar with the p38 pathway. p38 controls a myriad of housekeeping functions, anti-inflammatory pathways and various other processes. MK2 sitting downstream, once activated, specifically upregulates key pro-inflammatory signals such as TNF alpha, IL-1 beta and IL-6 that drive inflammation. Turning to Slide 23, ATI-450 works a little differently. It works downstream and does not block activation of anti-inflammatory pathways or affect other housekeeping functions of p38. It is designed to specifically target the pro-inflammatory pathways. Slide 24, we have tested this hypothesis in a mouse LPS induced TNF alpha model. Here we know that the global p38 inhibitor CDD-111 exhibited tachyphylaxis, i.e. loss inhibition overtime, which is similar to what was observed in clinical studies in both, inflammatory valve disease and RA studies historically with both global p38 inhibitors. In contrast, ATI-450 was observed to have a durable response, no tachyphylaxis, over the course of the study in this model. Turning to Slide 25, we have also studied ATI-450 in a variety of pre-clinical models demonstrating joint protection and preservation of bone in a rare arthritis model, anti-inflammatory action and preservation of the crypt architecture in a mouse ulcerative colitis model, decrease of IL-1 beta in a caps [ph] model, and reduction in bone metastasis in a mouse model which was affecting the stronger microenvironment. By targeting MK2 these studies demonstrate it may be possible to maintain efficacy in these models while avoiding the historic issues with traditional p38 therapeutics. We expect to file our IND in the middle of this year and them embark on sad-mad [ph] work in order to evaluate the efficacy in a small cohort of RA patients, and prove out the hypothesis that we have demonstrated preclinically. I will now turn it over to Dr. Stuart Shanler, our CSO, who will provide an update on our clinical activities and programs. Stu?